Summer K. Mersinger

Summer K. Mersinger

Summer K. Mersinger is the Director of the Office of Legislative and Intergovernmental Affairs at the Commodity Futures Trading Commission. In her role, she is the agency’s lead liaison with Members of Congress and serves as a key advisor to Chairman Tarbert on legislative matters. She is also in routine contact with representatives from other federal agencies and the Administration on a variety of CFTC related matters.

Ms. Mersinger has 20 years of Capitol Hill and government relations experience. Prior to joining the CFTC, she was Senior Vice President at Smith-Free Group, a leading government affairs practice, where she worked on financial services and other issues.

From 2004 to 2016, Ms. Mersinger was a top aide to current Senate Majority Whip John Thune, who represents her home state of South Dakota. Most recently she served as his Chief of Staff, coordinating legislative activities for Sen. Thune’s team and working regularly with Senate leadership and senior staff on both sides of the aisle. Ms. Mersinger was instrumental during policy debates involving banking, finance, telecommunications, surface transportation, agriculture, and trade issues. Ms. Mersinger was also directly involved in the communications efforts spearheaded by Sen. Thune through his leadership post on the Senate Republican Conference.

Prior to joining Sen. Thune’s staff, Ms. Mersinger was a director of government relations at Arent Fox, and she also worked in Sen. Thune’s office while he was a member of the U.S. House of Representatives from 1999 to 2002.


  • JD, The Catholic University of America, Columbus School of Law (2007)
  • BA, Political Science, University of Minnesota (1999)