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    Meet Our Expert Physicians
    Licensed Medical Doctors with decades of experience and time tested knowledge.

The Persona Doctors

Even the best physicians in private practice or at community hospitals are far too busy to keep studying daily, to do research or to frequently interact with leaders in their fields.

Our doctors, have to stay abreast of advanced research and the latest treatments. Better yet, our doctors have each other to discuss each case with. They learn from each other. That's why our patients have great results.

Christopher Ko, M.D.
American Board of Obesity Medicine
Dr. Christopher Ko received his undergraduate and medical degrees from Northwestern University. He completed his residency in Internal Medicine at Emory University. Dr. Ko is a diplomate of the American Board of Obesity Medicine and has been an active member of the Obesity Medicine Association. In his spare time, he enjoys playing tennis, cooking, and traveling with his wife and two children.
Joseph P. Gurrala, M.D
Member of the American Society of Bariatric Physicians
Throughout his education and career, Dr. Joseph Gurrala has pursued his interest in the interplay of biological and psychological factors that affect various diseases, including obesity. Dr. Gurrala received a Bachelor's of Science Degree from Houston Baptist University, where he double-majored in Biology and English Literature. He completed his medical training and received his Doctorate in Medicine at the historic Royal College of Surgeons in Ireland. Dr. Gurrala's practice philosophy incorporates an integrative approach to medical weight loss. When evaluating and treating patients, Dr. Gurrala focuses on biological, psychological, and social factors that are crucial to helping patients achieve their weight loss goals. Dr. Gurrala's background enables him to approach Medical Weight Loss with a holistic perspective in order to encourage positive behavioral changes and improve his patients' overall wellbeing.
Rosa A. Coca, M.D.
Member of the American Society of Bariatric Physicians
Dr. Rosa A. Coca received her medical degree from Universidad Central Del Caribe, School of Medicine, Puerto Rico, in 1986, and has over 20 years of experience in Internal Medicine. She completed her internship and residency at the Cabrini Medical Center in New York City, and went on to practice Internal Medicine at the Mennonite Hospital in Puerto Rico. While serving as their Consulting Physician, Dr. Coca added to her professional expertise by taking on additional roles as President of the Medical Records Committee, President of the Infectious Diseases Committee, and also served as the Director of the Department of Medicine. Dr. Coca’s clinical and professional experience has enabled her to focus her attention on improving the total wellness of patients through obesity prevention and treatment.
Dr. Heather N. Lorenzo, M.D.
Internal Medicine Physician
Dr. Heather N. Lorenzo is Board Certified in Internal Medicine, a fellow in the American College of Physicians and a Diplomate of the American Board of Obesity Medicine. Prior to working at Persona Doctors, Dr. Lorenzo served as Chief Medical Officer and Vice President of Medical Affairs for Meritus Health from 2012 to 2017. She provided her expertise to Meritus Health in several capacities before becoming Chief Medical Officer, including Chief Medical Information Officer, Physician Advisor to Care Management, and Interim Vice President of Medical Affairs. Prior to joining Meritus, she served as Medical Director of Hospitalists for Montgomery General Hospital in Olney, MD from 2005 to 2010 and was a hospitalist at Shady Grove Adventist Hospital in Rockville, MD from 2004 to 2005. Dr. Lorenzo served as Chief of Residents, Internist, and Associate Program Director for the Internal Medicine Residency at the David Grant Medical Center on the Travis Air Force Base in California from 2000 to 2004.
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