Dr. Mulcahy received his bachelor's degree in Chemistry from Manhattan College in Riverdale, New York. He then went on to complete his dental training at New York University, College of Dentistry. After practicing Dentistry for eight years, he decided to pursue a medical degree and enrolled at Kirksville College of Osteopathic Medicine in Kirksville, MO. Upon completion of an internship at Saint Vincent's Hospital in Worcester, MA and then a Family Practice Residency at the University of New England, College of Osteopathic Medicine in Biddeford, ME, he then fulfilled his public health service commitment with the National Health Service Corps. He accepted the position of Medical Director at Desert Senita Community Health Center in the rural town of Ajo, AZ. There Dr. Mulcahy practiced medicine for four years as the town's sole physician while supervising two physician's assistants.

After the completion of his National Health Service commitment in Arizona, Dr. Mulcahy relocated to Texas, where he worked out of offices in Fort Worth and Colleyville at an integrative practice called, The Fem Centre. At The Fem Centre he worked with two other Board Certified Gynecologists who specialized in Women's Bioidentical Hormone Replacement and Detoxification. While at this practice Dr. Mulcahy saw both men and women for family practice concerns as well as hormone related conditions, using a holistic approach.

Although finding the Fem Centre to be a very rewarding experience both personally and professionally, living in the congestion of the Dallas/Fort Worth area became difficult. While in South Portland during his residency training, Dr. Mulcahy and his family knew that Southern Maine was where they wanted to eventually settle, specifically in the Kennebunk area. In 2006 he made the decision to open his own practice, Southern Maine Integrative Health Center, where he has served as an integrative physician over the past 16 years, focusing treatment on a wide variety of chronic medical conditions. After closing his office practice, he continues to address these issues on a Consultation basis.

Professional memberships include:
American Osteopathic Association
International Lyme and Associated Diseases Society
Maine Osteopathic Association