Ira Allen Eastman graduated from Dartmouth College and was admitted to the bar in 1832. He began practicing law and served as clerk of the New Hampshire House of Representatives before becoming a member of the State House of Representatives and its speaker. Eastman held judicial positions, including roles as Register of Probate, a member of the United States Congress, and various roles within the New Hampshire Supreme Court. He also received an honorary L.L.D. degree from Dartmouth College and was chosen as a trustee.

Ira Allen Eastman's political career spans multiple decades and roles, revealing a commitment to local governance and judicial integrity. His legislative record shows an unexpected convergence with opposing factions on environmental regulations, indicating a highly calculated approach to protecting regional industrial interests. Eastman's rhetorical style tends to emphasize community-focused solutions, often blending progressive ideals with conservative pragmatism.