Seth began his career at the State Capitol in 2007 as an aide to the Chairman of the House Insurance Committee. He subsequently held various positions within the House of Representatives before transitioning to the State Senate, where he served as a policy analyst for the Chairman of the Senate Appropriations Subcommittee on General Government and Transportation.
In 2011, Seth joined Commissioner Mark Costello’s administration at the Oklahoma Department of Labor as the agency's Legislative Liaison. In this role, he focused on labor, workplace safety, and appropriations matters on behalf of the Department.
In 2012, Seth returned to the State Senate, serving as Chief of Staff for the Senate Health and Human Services Chairman. He remained in this role until 2016, when he joined James McSpadden and James Milner as an associate lobbyist.
In 2022, Seth was promoted to a named principal at McSpadden Milner Rott.
In addition to his extensive legislative experience, Seth has served as Special Projects Director for a prominent Oklahoma campaign consulting firm, providing policy, political, and campaign consulting services to various state legislative, statewide, and federal officeholders.