Cramer Announces Staff Transition, Names Micah Chambers Chief of Staff

WASHINGTON, D.C. - U.S. Senator Kevin Cramer (R-ND) today announced Chief of Staff Mark Gruman will depart his office on April 3, after accepting a position in the private sector. Micah Chambers will take over as his new Chief of Staff after serving as Cramer's Legislative Director, a position Mary Silverthorn will assume.

Gruman has served as Chief of Staff since 2013, overseeing operations in Cramer's Washington, D.C., office and helping implement his legislative and communications strategy. Gruman also worked for Cramer when he served as public service commissioner.

"Mark has been with me since my days on the Public Service Commission and has been my Chief of Staff ever since we got fully staffed up in the House," said Cramer. "He helped create a culture in our office of hard work and dedication to serving North Dakotans and advancing our priorities in Washington. Mark has been an invaluable advisor and leader and I'm grateful for the many years he's spent with me at the PSC and in Congress."

Chambers has served as Cramer's Legislative Director since 2019, managing the senator's policy team and legislative portfolio. Prior to joining Cramer's office, he worked at the Department of Interior during the first Trump administration. He also served as Deputy Chief of Staff and Legislative Director for U.S. Congressman Ryan Zinke (R-MT-01).

"Micah has an incredible track record as my Legislative Director and it has prepared him to seamlessly step up and serve as my Chief of Staff," Cramer continued. "He has an intuitive understanding of how to talk about and implement North Dakota-first policies and shares my commitment to providing top-notch constituent service in our state office."

Silverthorn is a North Dakota native who has been with Cramer since 2019. She has focused primarily on banking and financial policies, as well as tax and budget issues. She came to Washington, D.C. in 2017, where she began working for Senator John Hoeven (R-ND) after graduating from the University of Minnesota-Duluth with a degree in Political Science.

"Mary is not just my trusted advisor on complex banking issues, she is also a mentor to those around her," Cramer said. "She has developed a well-earned reputation for hard work and steady leadership on Capitol Hill and throughout the financial services industry, but her heart and soul remain grounded in reality thanks to her North Dakota roots."

Cramer was elected to his second Senate term in 2024 and serves on the Armed Services, Environment and Public Works, Veterans' Affairs, and Banking, Housing and Urban Affairs Committees.