Mark Leibowitz, M.D. is an experienced and skilled Investigator with approximately 25 years of research experience. Dr. Leibowitz has participated in an estimated 500 studies from Phase I-IV across a variety of different indications.

As part of his research portfolio, Dr. Leibowitz has conducted highly complex studies in healthy subjects and diverse patient populations including continuous cerebrospinal fluid studies, First in Human, Single and Multiple Ascending Dose studies, Ethnic bridging programs, QTc studies, as well as, serving as Principal Investigator for many adaptive trial designs. His experience includes leadership roles such as Medical Director for research sites located in California and Texas. In addition, he is currently a contributing member for a Data Safety Monitoring Board.

NRI is the leader in Metabolic and Liver Disease research with sites throughout the Los Angeles and Orange County. NRI specializes in other indications such as Women’s Health, Neurology, Psychiatry, GI and General Medicine.

NRI is thrilled to have Dr. Leibowitz as part of the leadership team and as one of our key Principal Investigators across all NRI sites.