John R. Huff

St. Luke's Episcopal Hospital provides medical and healthcare services. Its services include home health care, outpatient, surgical, cancer care, pulmonary care, rehabilitation therapy, and other health care services. The company was founded in 1954 and is headquartered in Houston, TX

The Explorers Club is a professional society founded in 1904 that is dedicated to the advancement of field research, scientific exploration, and resource conservation. The private company is based in New York, NY. Members of the club have explored the earth, seas, skies, and even the moon. The company offers opportunities to carry their historic flag in the field during exploration and supports young explorers from around the world through grants. The official online store of the Explorers Club is available, and the company provides updates on the latest announcements and news related to the club.

The Houston Museum of Natural Science operates a national museum. It consists of a planetarium, environmentally-controlled butterfly center, off-site observatory, advanced IMAX theatre and temporary and permanent exhibit halls. The museum features displays on subjects such as space science, energy, paleontology, chemistry, gems and minerals, ancient Egyptians, Native Americans and Texas wildlife. The company was founded in 1909 and is headquartered in Houston, TX.

Part of The National Academies of Science, the National Academy of Engineering operates as a professional membership organization. The company is based in Washington.

Georgia Tech Foundation, Inc. provides educational services. It promotes the cause of higher education in the State of Georgia, receives and manages financial donations received by the foundation for support and enhancement of the Georgia Institute of Technology and assists the Georgia Institute of Technology in its role as a leading educational and research institution. The company was in 1932 and is headquartered in Atlanta, GA.

Hi-Crush Proppants LLC engages in the provision of proppant and logistics solutions to the North American petroleum industry. The firm owns and has options to acquire sand excavating and processing locations located in Wisconsin. It also offers premium frac sand and logistics services to E&P companies, integrated service companies and pressure pumping companies, on contract and spot basis. Its services include transload, terminal and storage, and railcar storage and handling. The company was founded by Robert E. Rasmus and James M. Whipkey in October 2010 and is headquartered in Houston, TX.

Hi-Crush GP LLC is a producer and supplier of premium Northern White frac sand, which is used as a preferred prop pant in unconventional oil and gas wells. The company was founded in 2010 and is headquartered in Houston, TX.