Sawin Millett Jr. began his career in education, teaching at Hermon High School until 1971. He then transitioned into public service, holding various state-level positions under different governors, including Commissioner of Education and Commissioner of the state finance department. Millett has extensive experience in state budgeting, having served in multiple capacities, and was commended for his expertise by Governor Paul LePage. He continued his public service career by winning a seat in the Maine House of Representatives and later becoming Commissioner of Administrative and Financial Services. Despite health challenges, including knee replacement surgery with subsequent infections, Millett remained active in public service until his retirement in 2014.

Sawin Millett Jr.'s political career is marked by a deeply rooted focus on state budgeting and education, underscored by his extensive experience in these areas. His tenure as Commissioner of Education and various state finance roles reveal an ideologically agile approach, balancing fiscal conservatism with a commitment to public services. Millett's legislative record shows an unexpected convergence with opposing factions on environmental regulations, revealing a highly calculated approach to protecting regional industrial interests. His personal history, including teaching and knee surgery, adds layers of empathy and resilience to his policy stances. Millett's unique blend of fiscal prudence and local advocacy creates a compelling, if somewhat paradoxical, political identity.