Dr. Roth teaches at the Medical School and is actively involved in medical research, recognized nationally for his work in the fields of cancer research, immunology, emphysema, and the toxicology of inhaled substance abuse. He is a member of the American Thoracic Society, the American Association for Cancer Research, the American Association for Immunologists, the American Society on Neuroimmune Pharmacology, the International Cannabinoid Research Society, the Jonsson Cancer Center/UCLA, and other distinguished medical and research organizations.