Mariah's BioMariah Sixkiller is a Cornerstone senior consultant and managing partner of Sixkiller Consulting. She helps both corporate and non-profit clients advance their federal priorities in the defense, intelligence, and foreign affairs policy arenas.
From 2006 to early 2014, she was National Security Advisor to House Democratic Whip Steny Hoyer (D-MD), the second-ranking Democrat in the U.S. House of Representatives and former Majority Leader (2007-2011). This experience armed Mariah with the unique ability to provide clients with a Congressional leadership perspective and first-hand experience navigating the unique intersection of policy and politics that is required to achieve results in Congress. For more than a decade, she was engaged in nearly every aspect of shaping policy and moving legislation that involved foreign policy, defense, homeland security, intelligence, and trade matters through Congress.
During her years in Congressional leadership, Mariah Sixkiller honed a pragmatic approach that combined the ability to listen and collaborate across stakeholders, and placed a premium on bipartisan coordination and the capacity to compromise. This strategy helped clear the way for the House to pass a range of complex and politically delicate pieces of legislation, including the Foreign Intelligence Surveillance Amendments Act in 2008, the repeal of “Don’t Ask, Don’t Tell” in 2010, the Cyber Intelligence Sharing and Protection Act in 2012, and the Iraqi Special Immigrant Visa extension in 2013.
In addition to serving incoming Majority Leader Steny Hoyer (D-MD), Sixkiller worked for Senator Paul Sarbanes (D-MD) as his foreign policy advisor, staffing him at the Senate Foreign Relations Committee and non-profit board meetings. She was also Director of Research for Senator Maria Cantwell (D-WA), held a political appointment at OMB during the Clinton Administration, and worked in government affairs positions at a Fortune 500 company and the non-profit National Democratic Institute for International Affairs. Mariah is on the Boards of the Women in Military Service for America Memorial and the Council for a Livable World.