He is also co-founder and past-chairman of the CANN subdivision of the Chemical Health and Safety Division (DCHAS) of the American Chemical Society. His is also on the Board of Directors of the International Association for Cannabinoids as Medicine (Germany). He has a background in analytical chemistry and molecular pharmacology, he received his Ph.D. for contributions in characterizing the structure and function of the cannabinoid receptors. He is an author of the American Herbal Pharmacopeia's Cannabis Monograph and serves on multiple expert government, trade association committees, scientific organizations and is a court-qualified synthetic cannabinoid and cannabis expert. He has helped create the first standards for the medical cannabis industry with the American Herbal Products Association, as well as related educational training for clinicians and workers in the industry. He has been invited to speak at many international conferences, universities, hospitals, including the University of Leiden, Temple University School of Medicine, Princeton Hospital, and Yale University. Dr. Marcu is a recipient of the Billy Martin research award from the International Cannabinoid Research Society.