Our staff

Dr. Stephen Volk

Dr. Stephen Volk (Investigator) has been active in clinical trials since 2002. To date he has served as Principal Investigator on over 30 successfully completed studies and Sub-Investigator on 100 additional trials in the CNS area. Dr. Volk’s main responsibilities include consultation, evaluation and care for study patients. As Medical Director he provides guidance and monitoring of all investigators on adherence to GCP as well as tracking issues of inter-rater reliability, placebo effect minimization and data integrity.

With an extensive background in treating chronic and persistent mental illness both as a community psychiatrist for LA County-Dept of Mental Health (DMH) and in private practice over  the past 15 years, Dr. Volk is Board Certified in Psychiatry and Neurology.

Dr. Volk was the lead psychiatrist for the LA County/ DMH, the largest public mental health program in the U.S., Intensive Case Management Program, which was an outreach program designed to treat people with Schizophrenia who were refractory to conventional treatment. Dr. Volk has served as President of the Board of Directors for Shelter First, a non-profit agency with the mission to provide affordable housing to the chronically mentally ill in Los Angeles. He also served as elected representative for psychiatrists on the Advisory Committee to the Director of the LA County Dept. of Mental Health. In addition, Dr. Volk taught and supervised residents in the Dept. of Child and Adolescent Psychiatry at Univ. of Southern California (USC) as an Associate Professor of Behavioral Science. He remains active in community mental health as psychiatrist at the Coastal Asian Pacific Clinic in nearby Gardena.

His areas of interest include chronic mental illness (Schizophrenia and Bipolar Disorder), psychosomatics, pain management, and short-term dynamic psychotherapy. He is on staff at Del Amo Hospital in Torrance, CA.

Having completed his residency in Psychiatry from the LA County Medical Center,  LAC/USC in 1993, Dr. Volk then went on to complete his fellowship training in Child and Adolescent Psychiatry at LAC/USC in 1995. He served as Chief Resident in the Department of Child and Adolescent Psychiatry during that time.

Dr. Volk graduated from the University of Michigan (UofM)-Honors College in 1985 with a degree in Cellular and Molecular Biology. He began his career in research by completing his undergraduate honors thesis in wound healing in the Department of Dermatology at the UM. He received his MD degree in 1990 from Loyola University in Chicago, where he continued to do basic science research in the Dept. of Pathology in the area of thrombosis and homeostasis. He received the Sandoz Pharmaceutical Award for patient care as a medical student.


Dr. Thomas Apostle (Investigator) is an attending physician in the Department of Physical Medicine and the Department of Psychiatry at Cedars Sinai Medical Center as well as a Diplomat of the American Academy of

Physical Medicine and Rehabilitation and a Diplomate of the American Board of Psychiatry and Neurology.

Dr. Thomas Apostle

He is an active member in the North American Spine Society, the International Spinal Injection Society and the International Association for the Study of Pain.  He serves as an attending physician at the Cedars Sinai Medical Center Institute for Spinal Disorders and the Cedars Sinai Pain Center.

Dr. Apostle received his Bachelor of Science degree from Michigan State University, where he was a member of the Men’s Varsity Tennis Team.  He returned to East Lansing to earn his degree at the Michigan State University College of Osteopathic Medicine in 1990.  The following year, he trained in his internship at the Boston University affiliated Framingham Union Hospital.

Dr. Apostle completed his residency in Psychiatry at the Los Angeles County/USC Medical Center.  He remained in Los Angeles to complete a second residency in Physical Medicine and Rehabilitation at UCLA, where he served as the Chief Resident.  His residency research thesis “Prevalence of Median Nerve Entrapment (Carpal Tunnel Syndrome) in the Dominant Hand of Competitive Tennis Players” appears in the Archives of Physical Medicine and Rehabilitation.  Dr. Apostle’s unique combination of specialties is common to only nine physicians in the United States.

Dr. Apostle makes presentations in both professional and public organizations.  He has dedicated his practice to the treatment of patients with spinal disorders, pain, depression, and anxiety.