Dr. Lion received his undergraduate education at Harvard University, and his M.D. degree from the Albany Medical College of Union University in New York, following which he interned on the George Washington University Division of D. C. General Hospital in Washington. He thereafter completed his residency training in psychiatry at the Massachusetts General Hospital in Boston where he was a Research Fellow in Psychiatry at Harvard Medical School. After serving in the U. S. Navy, he joined the faculty of the University of Maryland School of Medicine in Baltimore where he began the Clinical Research program for Violent Behavior.

Dr. Lion has written over 100 articles and book chapters, and authored and edited seven textbooks, including volumes on personality disorders and psychopharmacology (both translated) and aggression. He has served on the editorial boards of journals and lectured internationally. Dr. Lion is Board-Certified in Psychiatry. He is a Distinguished Life Fellow of the American Psychiatric Association, a member of the American Academy of Psychiatry and Law, and in several professional and public databases including Who’s Who and Best Doctors in America.

Dr. Lion is in the full-time private practice of psychiatry in Baltimore, a Clinical Professor of Psychiatry at the University of Maryland School of Medicine, and an Adjunct Clinical Professor of Psychiatry at Temple University School of Medicine in Philadelphia, PA. He has also participated in teaching at the University of Maryland School of Law.