Owen A. Gallagher graduated from Boston College and Boston University School of Law, establishing a solid educational foundation. He began his career in public service, holding positions in the Massachusetts House of Representatives and the Massachusetts Senate. Gallagher also served as chairman of the board of street commissioners in Boston. He transitioned to urban development, leading the Boston Housing Authority's slum clearance and urban renewal program. During World War II, he served in the United States Navy as a lieutenant commander.

Owen A. Gallagher's political identity is marked by a unique blend of progressive urban policies and a deeply rooted localism. His advocacy for urban renewal and slum clearance, coupled with his long-standing involvement in Boston's political landscape, suggests a strategic focus on localized economic revitalization. Gallagher's military service adds an unexpected dimension, hinting at a disciplined approach to governance. His legislative record reveals an intriguing convergence with opposing factions on environmental regulations, indicating a calculated strategy to balance industrial interests with urban development.