Jon Santiago holds a robust background in public service and healthcare. He graduated from Yale School of Medicine and has dedicated significant time to community health initiatives, including service with the Peace Corps. Santiago's military experience includes enlisting in the United States Army Reserve, rising to the rank of major, and completing two overseas deployments. He served as a Massachusetts state representative, focusing on districts including South End, Roxbury, Back Bay, and Fenway neighborhoods of Boston. Santiago transitioned to the public sector, appointed as Secretary of the Executive Office of Veterans' Services, where he improved services and support for veterans. He currently works as an attending physician in emergency medicine at Boston Medical Center.

Jon Santiago combines a unique blend of medical expertise and political pragmatism, advocating for public health policies deeply informed by his experience as an emergency medicine physician. His tenure as Secretary of Veterans' Services reveals a calculated approach to policy, balancing bureaucratic efficiency with robust support for veterans. Santiago's legislative record shows an unexpected convergence with opposing factions on environmental regulations, revealing a highly localized strategy to protect regional industrial interests. His rhetorical style often frames complex issues through a community health lens, drawing from his Peace Corps experience and medical background.