Hyla Cass, M.D. is a noted author of several books, and Assistant Clinical Professor of Psychiatry, UCLA School of Medicine. She has integrated nutritional medicine with psychiatry in her clinical practice. A popular public speaker, consultant, and educator, her topics include complementary medicine and psychiatry, anti-aging, women's health (including natural hormone therapy), stress reduction, and natural treatments for addictions, anxiety disorders, and depression. She is also a frequent commentator in newspapers, magazines, radio, and television, contributor to numerous books and journals, and consultant to the supplement industry.

Dr. Cass graduated from the University of Toronto School of Medicine, interned at Los Angeles County-USC Medical Center, and completed a psychiatric residency at Cedars-Sinai Medical Center/UCLA.