Other Principals
Contact Information

P 202.296.8686

F 202.296.3323

1030 15th St. NW
Suite 1080 West
Washington, DC 20005


Marcus Sebastian Mason

Senior Partner

Marcus Sebastian Mason is a senior partner at The Madison Group (TMG). He is responsible for managing the firm's transportation, energy, tax and homeland security portfolio. In addition he focuses on crisis management, complex integrated campaigns and coalition building. Mason comes to the firm with more than fifteen years of political and policy experience.

Prior to joining TMG he served as Amtrak's Senior Director of Government Affairs responsible for advancing the company's strategic business initiatives in the House of Representatives, United States Senate and more than three dozen states.

Prior to his tenure at Amtrak, Marcus served as both Chief of Staff and Legislative Director for two California Members of Congress. During that time he initiated and had enacted a number of initiatives that impacted the 37th Congressional District and the State of California. Marcus won his first congressional campaign at age twenty-one before beginning his tenure as Capitol Hill's youngest Chief of Staff. He is undefeated in congressional campaigns he has managed.

Marcus is a member of the board of directors of the Congressional Black Caucus Foundation (CBCF) and previously served on the CBCF's Corporate Advisory Council (CAC). He is also on the board of directors Congressional Black Caucus Political Action Committee (CBC-PAC) and was responsible for managing the PAC's Independent Expenditure (IE) efforts for the 2010 election cycle. He was recently elected to his second term as President of the Board of Directors for the Washington Government Relations Group (WGRG), a non-partisan independent, volunteer association founded to enrich the careers and leadership abilities of African-American government relations professionals.

Marcus is also a published author who writes spy thrillers under the pen name Sebastian Cheney. He is the father of a Howard University freshman, Taelor Chanel.