About Us

Nurse Practitioners & Physician Assistant

Katie B. O’Brien, ANP

Katie B. O'Brien, A.N.P.

Katie O’Brien is an adult nurse practitioner, who has been working in dermatology since 2008. She earned her Bachelor of Science in Nursing from Southern Connecticut State University and her Master of Science in Nursing from Quinnipiac University. Katie completed a 1-year fellowship in dermatology at the Lahey Clinic. Prior to becoming a nurse practitioner, Katie worked as a critical care nurse at Yale-New Haven Hospital.

Katie is the current President of the New England Dermatology Nurse Practitioner Society and is a member of the Dermatology Nurses Association. Most recently, she has written a chapter in a dermatology textbook on disorders of pigmentation and photodermatosis. She enjoys all aspects of medical dermatology, her special interest is in hair loss and acne. She also provides variety of cosmetic injectable services, including Botox, Restylane and others. In her free time, Katie enjoys traveling, cooking and gardening. 


Elizabeth McNichol, FNP

Elizabeth McNichol is a family nurse practitioner. She graduated from the University of Vermont in 2004 with her BSN and worked for several years as a registered nurse specializing in Emergency and Post-Anesthesia Recovery departments in Vermont and in the Boston area. 

Having always been interested in dermatology, she received training in cosmetic treatments and injections as an RN. She then became more interested in general medical dermatology and decided to pursue a career as a nurse practitioner in the field. 

During her NP training at Boston College she did a clinical rotation at Mystic Valley Dermatology, and in 2014 she graduated from Boston College’s Family Nurse Practitioner program. She has been working in the field ever since. She is the current Treasurer of the New England Dermatology Nurse Practitioner Society.

She sees patients of all ages, and enjoys both medical and surgical aspects of treatment. Cosmetic dermatology is among Elizabeth’s special interests. She provides services in Botox injections and variety of filler injections, such as Juvederm, Volbella, Vollure and others.


Lindsay Demsey, PA-C

Lindsay Demsey, PA-C

Lindsay Demsey received her Bachelor Degree in psychology from Indiana-Purdue University in 2006. She then went on to receive her Masters of Science in Physician Assistant Studies from Northeastern University in 2011. She is a member of the Society of Dermatology Physician Assistants, the American Academy of Physician Assistants and the Massachusetts Association of Physician Assistants.

Lindsay is a board certified Physician Assistant with a professional interest in management of skin cancer. As a member of the Mohs surgery team, Lindsay directly assists in the operating room and is actively involved in pre-operative and post-operative care of our patients.