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Welcome to Regeneris Boston

Our team is dedicated to helping you look and feel your best


We offer a variety of surgical and non-surgical dermatological, aesthetic and regenerative procedures at our three Massachusetts offices in Westwood, North Attleboro and Raynham. Our experienced team of providers includes plastic, reconstructive and MOHS surgeons, physician assistants, and regenerative medicine expert Dr. Ryan Welter MD PhD. Our focus is on minimally invasive, advanced therapies - including stem cell therapies - that help our patients turn back the clock to look and feel their best.


Meet the Team


Ryan Welter, MD., Ph.D

Ryan Welter, MD, PhD is the CEO and Medical Director of Regeneris Medical. Dr. Welter obtained his doctorate in Biochemistry and Molecular Biology from Oklahoma State University and his M.D. from the University of Oklahoma. He completed his residency at Brown University Medical School, where he now serves as Clinical Associate Professor. In 2002, Dr. Welter founded Tristan Medical, which has grown to be one of the largest providers of primary, urgent, and occupational health care in Southeastern Massachusetts, serving over 70,000 patients a year. In 2005, Dr. Welter began a successful hair restoration practice and founded the New England Center for Hair Restoration, creating a state-of-the-art operating suite designed exclusively for accommodating hair transplant surgery. Research continues to be very important to Dr. Welter, and he hopes to see regenerative technology and research come together to benefit health care at Regeneris Medical Boston.


Justine Davis
Registered Surgical Nurse

Justine Davis, R.N., is a registered surgical nurse with over 14 years of experience working in plastic surgery offices in the Boston area. She graduated from Massachusetts Bay College with a degree in nursing. Justine is a Master Nurse Injector with over 10 years of injecting experience. Since starting her career, she has worked with some of the best plastic surgeons in New England. Her gentle touch and keen eye for beauty, aesthetics, and the anatomy of the aging face, make her an excellent addition to our Aesthetics Team.

Nonna Khachiyan
Physician Assistant

Nonna Khachiyan, PA-C is an experienced dermatology practitioner with over ten years of general dermatology, surgical and laser therapy experience. She received her Bachelor of Science in Radiation Biology with Magna Cum Laude from Suffolk University, and a second Bachelor’s degree in Health Sciences from Mass College of Pharmacy and Health Sciences. She also completed her Master’s of Physician Assistant Studies from Mass College of Pharmacy. Following her studies, Nonna has been practicing for many years in the field of general dermatology and is a seasoned veteran in the diagnosis and treatment of skin diseases, particularly eczema, acne, psoriasis, skin cancer and acute skin eruptions.

Inna Wegner
Physician Assistant

Inna Wegner, PA-C, is a certified Physician Assistant specializing in Dermatology. She graduated summa cum laude with a Bachelor of Science/Pre-med from Massachusetts University and experience working as Licensed Medical Esthetician and is passionate for skin care and cosmetic procedures. She is dedicated to delivering effective care to all her patients with a focus on total health and beauty.

Tiffany DeGrazia
Medical Assistant

Tiffany DeGrazia is a certified Medical Assistant. She is also a Certified trusculpt Cutera Laser Tech and Certified Excimer Laser Tech. Tiffany has a degree in Health Sciences and assists our Dermatologists at our Raynham office. Tiffany ensures every patient receives the excellent patient care. Tiffany is currently enrolled in an Aesthetician program and is working towards becoming a certified Medical Aesthetician. Her goal is to make all of her patients feel and look their absolute best.