Susan DeRoy grew up in Kittery, Maine, and attended Traip Academy. She pursued higher education at the University of Southern Maine and Augusta. DeRoy spent many years residing in New Durham, New Hampshire, with her husband. She has demonstrated leadership capabilities by managing institutional risk in high-finance before transitioning to the public sector.

Susan DeRoy's political identity is marked by a strategic alignment with traditionally opposing factions on environmental regulations, hinting at a highly localized approach to policy. Her rhetorical style often emphasizes community-specific benefits, creating a nuanced narrative that balances ideological consistency with pragmatic flexibility. Despite her Republican affiliation, DeRoy's legislative record reveals unexpected alliances, suggesting a willingness to transcend partisan divides for the sake of regional interests.