Providers All of our providers are on staff at Baystate Medical Center in Springfield and work closely with specialists within the medical center and surrounding communities. We have a special focus on hypertension, diabetes, and asthma care. Meet Our Medical Staff James L. Mugford, M.D. Kevin G. Epstein, M.D. Jose M. Vinagre, M.D. Jessica Zina-Duarte, M.D.