Meet Our Team

John Marshall Mullins, M.D.

For the last 20 years, Dr. Mullins served as the Co-founder and President of the MESA Medical Group, the largest provider of Emergency and Hospitalist Physician Services in Kentucky. He specializes in recreating the manner in which medical services are delivered by instituting efficiency measures, programs based on accountability and results, and unwavering customer service.

With his expertise and knowledge, Dr. Mullins started Marshall Lifestyle Medicine, conceptualizing a new way of viewing health, aging, happiness and balance. Through the power of technology and concierge care, Dr. Mullins focuses on putting patient needs first and helping you to look, feel and perform your best.

Richard Miller D.O.

Dr. Miller is a board-certified Internal Medicine physician. He received his undergraduate degree from The University of Texas at Austin and his medical degree from The University of North Texas Health Science Center – Texas College of Osteopathic Medicine. Dr. Miller completed his residency in Internal Medicine at LewisGale Hospital Montgomery in Blacksburg, Virginia, where he also served as a Hospitalist physician and faculty member for the residency program. He and his wife, Amanda, moved to Lexington in 2023 with their dog, Bear. Dr. Miller enjoys spending time with his family, golf, exercise and traveling. 

Sarah Congleton, PA-C

Meet Sarah, a nationally certified Physician Assistant. Sarah received her Bachelor of Science degree in Biology from Eastern Kentucky University in Richmond, Kentucky and graduated Cum Laude. She then earned her Master of Science degree in physician assistant studies from the University of the Cumberlands in Williamsburg, Kentucky.

During her educational journey in PA school, she developed a strong passion for aesthetic medicine alongside her passion for primary care. Her goal as a provider is to help every patient feel comfortable in their own skin while becoming the healthiest, happiest version of themself possible. Sarah has been an Aesthetic Injector for many years and has completed a variety of training with Allergan and Galderma.

Jared Harper, PA-C

Jared Harper is a Physician Assistant with a passion for longevity medicine. He received his undergraduate degrees from Eastern Kentucky University in Spanish and Biomedical sciences and his PA-C/MSPAS from The University of Kentucky. He previously worked in family medicine for six years. Jared transitioned to working with Dr. Mullins, where he can focus on his clinical interests of integrative medicine, health span, longevity medicine, and biohacking. He and his wife, Megan, moved to Lexington in 2022 with their dog, Mac. Jared enjoys weight training, hiking, and traveling during his free time.

Madison Buckner, NP

I am a Family Nurse Practitioner with experience in healthcare since 2018 and a background in aesthetics. I went to the University of Louisville for my Bachelor of Science in Nursing degree and the University of Chamberlain for my Master's in Nursing. I am incredibly excited to be joining the Marshall team to focus on longevity medicine and help others feel better on the inside and out. In my free time I enjoy spending time with my family, soaking up warm sunny days and traveling.