Weight Loss Clinic Oak Ridge

Holly massengill, msn, nurse practitioner

Holly obtained her Master of Science Degree in Nursing from Lincoln Memorial University, where she graduated summa cum laude and first in her class. She is also a graduate of Tennessee Technological University where she obtained her Bachelor of Science Degree in Nursing, where she also graduated summa cum laude. She has over twelve years of experience in the medical field, in which more than eight have been completed working in nutrition, fitness, and weight management and the other four were completed as a Registered Nurse at Parkwest Medical Center.

She is Board Certified and Credentialed by the following:

  • The American Nurses Credentialing Center (ANCC) as a Family Nurse Practitioner and the Tennessee Board of Nursing as an Advanced Practice Nurse (APN) and Registered Nurse (RN)
  • The American Heart Association in Advanced Cardiac Life Support (ACLS) and Basic Life Support (BLS)
  • She is a member of the Tennessee Nurses Association and the American Nurses Association

Over the past eight years Holly has discovered that helping individuals achieve a healthier way of life is really her passion. Apart from that though, she also has a strong passion for missions around the world, particularly in Haiti, where she loves to do medical mission work. If she isn't working or doing missions, she's usually spending time with her family, including her two Small Breed Rescue dogs, Yogi-Bear and Bella.

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Kirsten Rhodes, AAS, Medical assistant

Kirsten received her Associates of Science Degree from Pellissippi State Community College. She also received her national Medical Assistant certification from the University of Tennessee. 

Following high school, she worked as a childcare provider where she spent three years working and caring for children, while attending college. She has spent over two years working in customer service.

Over the past few years, she has discovered her passion for fitness. She has a strong drive to help others fulfill their fitness and health needs and is eager to assist them along the way.  Aside from working, she enjoys being outside, spending time with her family and friends, and working out at the gym. 


Dr. Bertram Prosser, M.D. MPH, Medical director

Dr. Bertram Prosser received his medical degree from the Albert Einstein College of Medicine in Bronx, New York. He completed residency training at the University of Arizona South Campus in Tucson, Arizona, and also completed a Masters in Public Health from Harvard University. He primarily practices as an Emergency Physician and became interested in weight management as a means of controlling a common risk factor for many diseases frequently seen in his work in the Emergency Department.

Prior to attending medical school Dr. Prosser attended the US Naval Academy, where he earned a Bachelor's Degree and spent the next 9 years as a Naval Aviator.