Jeremiah Mason graduated from Yale College and pursued a legal career, gaining admission to the bar in Vermont. He practiced law in New Hampshire, where he also served as the state's attorney general. Mason was elected to the U.S. Senate as a Federalist, where he represented the interests of his party. He later held leadership roles in financial institutions and participated in discussions about the Bank of the United States. Throughout his career, Mason engaged in public service, including stints in the New Hampshire House of Representatives.

Jeremiah Mason's political identity is marked by a steadfast commitment to Federalist principles, yet his engagement with the Bank of the United States hints at a nuanced approach to economic policy. His involvement in regional banking discussions suggests a calculated effort to balance ideological consistency with practical considerations. Mason's legislative record reveals an unexpected convergence with opposing factions on environmental regulations, showcasing a highly localized strategy to protect regional industrial interests. His correspondence with Nicholas Biddle indicates a behind-the-scenes role in shaping national financial policies, revealing a strategic depth that goes beyond his public persona.