Where the experts come to work

For nearly four decades, CenExel ACMR has been dedicated to assisting pharmaceutical companies find new cures to help patients better manage their healthcare.

Center Leadership

Sarah Kazmi

Sarah Kazmi, MD

VP and General Manager

Dr. Kazmi is bringing 15 years of extensive experience in Phase I-IV clinical trials spanning many therapeutic areas. She has a strong leadership background and a proven track record of managing large clinical research sites.

Dr. Robert Riesenberg

Robert Riesenberg, MD

ACMR Founder and Principal Investigator

Dr. Riesenberg is a research psychiatrist with four decades of experience. His primary focus is on CNS, PK, Healthy Normal, and Child/Adolescent disorders. Dr. Riesenberg has been the Principal Investigator in over 600 studies.

Dr. Riesenberg earned a bachelor’s degree in both Zoology and Psychology from Memphis State University in 1972. In 1975, he earned his MD from the University of Tennessee. He is licensed to practice in Georgia.

Meet Our Physicians / Investigators

Dr. Mahendra Dave

Mahendra Dave, MD

Principal Investigator

Dr. Dave is a board certified Psychiatrist and a Distinguished Fellow of the American Psychiatric Association. He is a Sub-Investigator for the Atlanta Center for Medical Research for clinical trials that focus on adult psychiatric diseases, CNS, PK, Healthy Normal and Child/Adolescent disorders. He is licensed to practice in Georgia.

Dr. Dave has had several publications in various professional, peer reviewed journals, including American Family Physician, JAMA, The Psychiatric Hospital, Journal for Contemporary Social Work, Journal of Clinical Psychiatry, Canadian Journal of Psychiatry, American Journal of Psychiatry, Annals of Clinical Psychiatry, Biological Psychiatry, the Journal of Pharmacy Technology, and American Journal of Geriatric Psychiatry. Dr. Dave is also the lead author of the book Psychiatric Medicine, The Psychiatrist’s Guide to the Treatment of Common Medical Illnesses published by Lippincott, Williams, and Wilkins.


Maria Johnson, MD

Principal Investigator

Dr. Johnson is certified by the American Board of Psychiatry and Neurology, which means she has demonstrated knowledge, competency, and specialized skills in the treatment of psychiatric disorders. Since she began practicing in 2007, she has encountered a wide range of patients, settings, and situations. These experiences, combined with motivation to help those who suffer and excitement about new developments in the understanding of the human brain, have led to a very well-rounded set of skills.

She is a graduate of of Oglethorpe University in Atlanta, obtained her medical degree from the Medical College of Georgia, and trained in Psychiatry at The University of Arizona. She completed a fellowship in Psychopharmacology Reserach and completed residency at The Medical College of Georgia. She is experienced in outpatient, inpatient, public, private, child, adult, and geriatric psychiatry.

She has special interest in Autism Spectrum Disorders and edited a book called Asperger’s Disorder published in 2008. More recently, she has focused on Telepsychiatry, developing skills in the management of the technology required for Telepsychiatry, as well as the medium’s impact on her relationship with her patients.

Dr. Mark Lerman

Mark Lerman, MD

Principal Investigator

Dr. Lerman has more than 25 years of experience, almost entirely in psychiatric medical research, conducting over 300 studies. He is also on CenExel’s Psychiatric Advisory Board.
Dr. Stan Plavin

Stan Plavin, MD

Principal Investigator

Dr. Plavin, a Diplomate of the American Board of Anesthesiology (ABA), is owner and co-founder of Technical Anesthesia Strategies and Solutions LLC, a medical consulting and advisory firm, and founder of Ambulatory Anesthesia Partners LLC, an Atlanta-based physician practice. His continued operation of these organizations augments the CenExel ACMR network for recruiting study participants for several therapeutic areas, including acute pain.

Dr. Plavin received his Doctor of Medicine degree from the University of Vermont College of Medicine and completed his residency in anesthesiology at Emory University affiliated hospitals. He is licensed in medicine and surgery in multiple states, including Georgia and South Carolina. He has been an active speaker and lecturer at scientific meetings since 2011 and has published several peer-reviewed articles on surgery and anesthesia-related topics.

He frequently attends meetings with the American Society of Anesthesiologists and maintains current certification in BLS, ACLS, and PALS. Dr. Plavin has two children, resides in Atlanta and is active in organized medicine and anesthesiology on a local, state, and national level. He enjoys quality time with his family, children, sports, travel, and music.

Safety and quality are paramount

Our physicians have extensive backgrounds in their respective medical specialties and always prioritize patient safety.




200+ years of collective clinical trial experience


Assisted by expertly-trained medical staff

Research Facility

Converted Hospital

With existing healthcare facility infrastructure and redesigned specifically for clinical research, CenExel ACMR offers a unique, world-class experience.


100,000 square feet of dedicated medical research space


On-site PBMC lab


14 inpatient units


2,000 square foot cafeteria with licensed dietician


Conveniently located near Atlanta’s Hartsfield-Jackson international airport and within walking distance of public transportation


CenExel ACMR

501 Fairburn Road SW
Atlanta, GA 30331

Monday – Friday    8AM – 4:30PM

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We’re a CenExel
Center of Excellence

Centers of Excellence provide unparalleled attention to detail to assure consistent and first-class quality in patient care. We have supported tens of thousands of studies, the variety and complexity of which have resulted in a great depth of experience for the principal investigators and research staff at each Center.

We deliver engagement, expertise, and results.


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