Dr. Shanahan received his training at The University of Medicine and Dentistry of New Jersey in Newark, New Jersey.

Dr. Shanahan is a practicing primary care physician with board certification in both Internal and Addiction Medicine. He is a general internal medicine physician or internist. These are primary-care doctors who perform physical exams and treat a wide spectrum of common illnesses in adult men and women. Dr. Shanahan is affiliated with a number of local Community Health Centers, including Mattapan Community Health Center, comprising the Boston HealthNet. He is affiliated with Boston Medical Center and is also an Assistant Professor at Boston University School of Medicine. He is the Director of the Community Medicine Unit within the Section of General Internal Medicine at Boston University School of Medicine. Dr. Shanahan's areas of specialization are Substance Abuse, Health Care Disparities, Information Technology, and Community-Based Medicine. He maintains active working relationships with multiple community-based organizations. Dr. Shanahan graduated from Rutgers University in New Brunswick, NJ before receiving his medical degree from The University of Medicine and Dentistry of New Jersey in Newark, NJ. He also holds an MPH from Harvard School of Public Health, Cambridge MA. Dr. Shanahan completed his residency at Montefiore Medical Center, Bronx, NY. Dr. Shanahan speaks multiple languages, including French.