Dr. Gregory M. Sullivan, also known as Greg, M.D., has been the Chief Medical Officer of Tonix Pharmaceuticals Holding Corp. since June 3, 2014 and Secretary since March 2017. Dr. Sullivan is a physician and scientist specializing in somatic treatments of psychiatric disorders. He is an Assistant Professor of Clinical Psychiatry in the Department of Psychiatry at Columbia University (CU). Dr. Sullivan's research focuses on the neurobiology and treatment of affective and anxiety disorders and much of his work employs fully quantitative neuroreceptor mapping using positron emission tomography (PET) brain imaging technology. He is also a Research Scientist of the New York State Psychiatric Institute (NYSPI), and he serves as a member of the Institutional Review Board (IRB) of NYSPI and the CU Department of Psychiatry. His work during an NIMH Mentored Clinical Scientist Development Award (K08) has lead to several important findings on the role of the serotonin-1A receptor in both mood and anxiety disorders. In 2010, he was selected by his peers in psychiatry as one of the 2010 Best Doctors in America. He attended CU for residency training in psychiatry. After residency, he continued at CU in an NIMH-sponsored Research Training Fellowship in Affective and Anxiety Disorders. As part of fellowship training, he spent substantial time in the laboratory of Dr. Joseph LeDoux at New York University, developing translational animal models of anxiety disorders for preclinical testing of novel anxiolytic therapies. Dr. Sullivan served as a Member of Scientific Advisory Board at Tonix Pharmaceuticals Holding Corp. (formerly, Tonix Pharmaceuticals, Inc.) since October 2010. Dr. Sullivan holds BA in Biology from the University of California, Berkeley. He received his MD from CU's College of Physicians & Surgeons.