Sheldon D. Glass

MedMark Services, Inc. operates opioid addiction and dependency treatment centers. It offers medication-assisted treatment services including individual substance abuse counseling to address the issues of addiction. The company was founded in 1998 and is headquartered in Lewisville, TX.

Friends Research Institute, Inc. is a non profit organization which is engaged in improving public health and well-being through education, treatment, grants administration, and research. It employs researchers to conduct studies in the areas of criminal justice, mental health, HIV/AIDS, health, and substance abuse; and these studies have been funded by private, county, state, and federal sources. The company was founded by Edythe Klotzman and Aaron Klotzman in 1955 and is headquartered in Baltimore, MD.