Kenneth A. Merchant
Directeur/Bestuurslid bij Pasadena Angels, Inc.
Momenteel actieve connecties
Naam | Geslacht | Leeftijd | Verwante bedrijven | Samenwerking |
---|---|---|---|---|
Larry Taylor | M | 71 |
NACD Pacific Southwest Chapter, Inc.
NACD Pacific Southwest Chapter, Inc. Miscellaneous Commercial ServicesCommercial Services NACD Southern California Chapter, Inc. is the membership organization focuses on board leadership. The firm provides independent board evaluations and custom-tailored in-boardroom education and training programs, as well as director-led conferences, forums and peer-exchange learning opportunities to share ideas about current and emerging issues. The company was founded in 1977 and is headquartered in Redondo Beach, CA. | 12 jaar |
Nancy Dandridge | F | - |
Pasadena Angels, Inc.
Pasadena Angels, Inc. Investment ManagersFinance Pasadena Angels, Inc. (Pasadena Angels) is an angel investment firm founded in 2000 by DuWayne J. Peterson. The firm is headquartered Altadena, California. | 7 jaar |
Kishore Venkata Seendripu | M | 54 | 9 jaar | |
Chris Wadden | M | - |
Pasadena Angels, Inc.
Pasadena Angels, Inc. Investment ManagersFinance Pasadena Angels, Inc. (Pasadena Angels) is an angel investment firm founded in 2000 by DuWayne J. Peterson. The firm is headquartered Altadena, California. | 15 jaar |
Leonard Schaeffer | M | 78 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | 17 jaar |
Adam Spice | M | 55 | 9 jaar | |
Mike Krebs | M | - |
Pasadena Angels, Inc.
Pasadena Angels, Inc. Investment ManagersFinance Pasadena Angels, Inc. (Pasadena Angels) is an angel investment firm founded in 2000 by DuWayne J. Peterson. The firm is headquartered Altadena, California. | 7 jaar |
Thomas D. Lyon | M | - |
Pasadena Angels, Inc.
Pasadena Angels, Inc. Investment ManagersFinance Pasadena Angels, Inc. (Pasadena Angels) is an angel investment firm founded in 2000 by DuWayne J. Peterson. The firm is headquartered Altadena, California. | 7 jaar |
Rod Perth | M | - |
Pasadena Angels, Inc.
Pasadena Angels, Inc. Investment ManagersFinance Pasadena Angels, Inc. (Pasadena Angels) is an angel investment firm founded in 2000 by DuWayne J. Peterson. The firm is headquartered Altadena, California. | - |
Tracey Carpentier | F | - |
Account Control Technology Holdings, Inc.
Account Control Technology Holdings, Inc. Miscellaneous Commercial ServicesCommercial Services Account Control Technology Holdings, Inc. engages in the provision of revenue cycle management services. It offers business process outsourcing, debt management, collection, and call center services. The company was founded in 1990 by Dale J. Van Dellen and is headquartered in Los Angeles, CA. | 8 jaar |
Frank Price | M | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Rose Washington-Jones | F | 59 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Kenneth R. Klein | M | 64 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Carol Mauch Amir | F | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | 25 jaar |
Joe Boskovich | M | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Charles E. Harper | M | 76 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Richard Munro | M | - |
NACD Pacific Southwest Chapter, Inc.
NACD Pacific Southwest Chapter, Inc. Miscellaneous Commercial ServicesCommercial Services NACD Southern California Chapter, Inc. is the membership organization focuses on board leadership. The firm provides independent board evaluations and custom-tailored in-boardroom education and training programs, as well as director-led conferences, forums and peer-exchange learning opportunities to share ideas about current and emerging issues. The company was founded in 1977 and is headquartered in Redondo Beach, CA. | 6 jaar |
Sugath Warnakulasuriya | M | - |
Pasadena Angels, Inc.
Pasadena Angels, Inc. Investment ManagersFinance Pasadena Angels, Inc. (Pasadena Angels) is an angel investment firm founded in 2000 by DuWayne J. Peterson. The firm is headquartered Altadena, California. | 10 jaar |
Stanley Phillip Gold | M | 81 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Andrew J. Viterbi | M | 88 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Jim Schaefer | M | - |
Pasadena Angels, Inc.
Pasadena Angels, Inc. Investment ManagersFinance Pasadena Angels, Inc. (Pasadena Angels) is an angel investment firm founded in 2000 by DuWayne J. Peterson. The firm is headquartered Altadena, California. | - |
Joseph Pitruzzelli | M | - |
Pasadena Angels, Inc.
Pasadena Angels, Inc. Investment ManagersFinance Pasadena Angels, Inc. (Pasadena Angels) is an angel investment firm founded in 2000 by DuWayne J. Peterson. The firm is headquartered Altadena, California. | 6 jaar |
Warren Jenson | M | 67 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Mustapha Baha | M | - |
Pasadena Angels, Inc.
Pasadena Angels, Inc. Investment ManagersFinance Pasadena Angels, Inc. (Pasadena Angels) is an angel investment firm founded in 2000 by DuWayne J. Peterson. The firm is headquartered Altadena, California. | 19 jaar |
Keith E. Bechard | M | 72 | 15 jaar | |
Stender Sweeney | M | 64 |
Pasadena Angels, Inc.
Pasadena Angels, Inc. Investment ManagersFinance Pasadena Angels, Inc. (Pasadena Angels) is an angel investment firm founded in 2000 by DuWayne J. Peterson. The firm is headquartered Altadena, California. | 22 jaar |
David Mandel | M | - |
Pasadena Angels, Inc.
Pasadena Angels, Inc. Investment ManagersFinance Pasadena Angels, Inc. (Pasadena Angels) is an angel investment firm founded in 2000 by DuWayne J. Peterson. The firm is headquartered Altadena, California. | 5 jaar |
Kevin F. Pickard | M | 59 |
Universal Guardian Holdings, Inc.
Universal Guardian Holdings, Inc. Miscellaneous Commercial ServicesCommercial Services Universal Guardian Holdings, Inc. provides security products and services to mitigate terrorist and security threats. The company was founded on August 31, 1989 and is headquartered in Newport Beach, CA. | 18 jaar |
John Kusmiersky | M | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Harylyne Norris | F | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
William M. Kec | M | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
David H. Dornsife | M | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Robert Padgett | M | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Gregory P. Brakovich | M | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Barry Diller | M | 82 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Dan Moldovan | M | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Barbara J. Rossier | F | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Elizabeth Garrett | F | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | 19 jaar |
Albert R. Checcio | M | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Todd R. Dickey | M | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | 28 jaar |
Sharon Orrange | M | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Varun Soni | M | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Fred Aminzadeh | M | 75 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Bob Elliott | M | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Chun Kit Ho | M | 47 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Babak Ziai | M | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | 9 jaar |
Denis Phares | M | 52 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Patrick Kapsner | M | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Parker Jenkins | M | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Thomas H. Jordan | M | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
W. Daniel Hillis | M | 68 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Wei Lyu | M | 60 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
David S. Tappan | M | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Steven Spielberg | M | 77 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Lydia Kennard | F | 69 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | 19 jaar |
Paul Kern | M | 78 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Chen Ming Hu | M | 76 |
University of California, Berkeley
| 48 jaar |
Parkash Gill | M | 73 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Diane D. S. Tang-Liu | M | 67 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
John B. Slaughter | M | 88 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | 25 jaar |
Jerry W. Neely | M | 87 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
W. Grant Gregory | M | 83 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Alberto Luigi Sangiovanni-Vincentelli | M | 76 |
University of California, Berkeley
| 48 jaar |
Thomas S. Sayles | M | 73 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | 13 jaar |
LeRoy Carlson | M | 78 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Katrina A. Garnett | F | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | 6 jaar |
Joan Ann Payden | F | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Mark Friedman | M | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Robert Coury | M | 63 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | 10 jaar |
Larry Livingston | M | 81 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | 38 jaar |
Ming Hsieh | M | 68 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | 17 jaar |
N. Darius Sankey | M | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Stuart Diamond | M | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Ramona L. Cappello | F | 64 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | 10 jaar |
Richard Spivey | M | 74 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Dana Walden | F | 59 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
George Bekey | M | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
John Steven Underkoffler | M | 56 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Jordan K. Weisman | M | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Peter Pak | M | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Rick J. Caruso | M | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Diku Mandavia | M | 58 |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | - |
Llewellyn Cox | M | - |
University of Southern California
University of Southern California Other Consumer ServicesConsumer Services University of Southern California is a private research university that mainly offers undergraduate, graduate & other higher education. The university was founded in 1880 and is headquartered in Los Angeles, CA. | 1 jaar |
Relatiegrafiek
Connectie in verschillende bedrijven
Oude connecties
Naam | Geslacht | Leeftijd | Verwante bedrijven | Samenwerking |
---|---|---|---|---|
Michael Ziering | M | - |
Diagnostic Products Corp.
Diagnostic Products Corp. Medical SpecialtiesHealth Technology Diagnostic Products Corp. provides immunodiagnostic systems, which includes IMMULITE series of immunoassay systems, more than 75 immunoassays. It also designs and manufactures automated laboratory instrumentation and automation solutions. Diagnostic Products is located in Los Angeles, CA. | 20 jaar |
Theodore Tewksbury | M | 67 | 5 jaar | |
Patrick C. Henry | M | 61 | 11 jaar | |
Carl Perez | M | - |
University of California, Berkeley
| 8 jaar |
Kathleen M. Hagerty | M | - |
University of California, Berkeley
| 8 jaar |
Michael Farese | M | 77 | 4 jaar | |
Ibrahim Hasan | M | 71 |
University of California, Berkeley
| 6 jaar |
Bahram Nour-Omid | M | - |
University of California, Berkeley
| 4 jaar |
Shieng-Chang Tseng | M | 74 |
University of California, Berkeley
| 4 jaar |
Richard G. Wallace | M | - |
University of California, Berkeley
| 7 jaar |
Kevin A. Westcott | M | 57 |
Universal Guardian Holdings, Inc.
Universal Guardian Holdings, Inc. Miscellaneous Commercial ServicesCommercial Services Universal Guardian Holdings, Inc. provides security products and services to mitigate terrorist and security threats. The company was founded on August 31, 1989 and is headquartered in Newport Beach, CA. | - |
Jackie W. Hoffmann | F | - |
University of California, Berkeley
| 6 jaar |
Thomas E. Tighe | M | - |
University of California, Berkeley
| 7 jaar |
Eric Stonestrom | M | 62 |
University of California, Berkeley
| 6 jaar |
Frank Elliott | M | - |
University of California, Berkeley
| 6 jaar |
James Hildebrand Roberts | M | 67 |
University of California, Berkeley
| 5 jaar |
Wai Cheung Tong | M | 70 |
University of California, Berkeley
| 3 jaar |
Statistieken
Land | Connecties | % van het totaal |
---|---|---|
Verenigde Staten | 100 | 100.00% |
Ouderdom van de connecties
Actief
Verleden
Man
Vrouw
Besturend
Uitvoerend
Oorsprong van de connecties
- Beurs
- Insiders
- Kenneth A. Merchant
- Persoonlijk netwerk