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Marcus Sebastian Mason

Senior Partner

From Washington, DC to Los Angeles, Marcus Sebastian Mason is often called on to help unlock the doors to the corridors of power. He advises heads of state, C-level executives, and policymakers at the highest level. Marcus’s exceptional accomplishments and relationships have earned him a stellar reputation as one of Washington DC's most influential and effective lobbyists. From winning his first congressional campaign at the remarkable age of twenty-one to becoming Capitol Hill's youngest Chief of Staff, Marcus's journey has been nothing short of remarkable. As the Senior Partner of the prestigious Madison Group, Marcus has spearheaded groundbreaking initiatives, shaped policies, and facilitated unparalleled connections with policymakers, leaving an indelible mark on the nation's capital.


His early triumphs in congressional campaigns marked the beginning of a journey that would lead him to become a trusted advisor and confidant to California elected officials in Los Angeles City, Los Angeles County, and Sacramento, as well as the California Congressional Delegation and throughout the country. Marcus's ability to cultivate strong relationships at every level of government sets him apart as a skilled strategist and a powerful advocate for his clients.


Having served as an advisor to both campaigns of President Barack Obama, as well as a trusted advisor to the Obama-Biden White House, Marcus possesses a unique insight into the highest echelons of power. His experience as a member of the Democratic National Committee and as a Super Delegate further solidifies his role as a key player in shaping national policies and priorities. Recently, President Biden appointed Marcus to serve on the Democratic National Committee, a testament to his enduring impact in the political landscape.


Marcus's dedication to fostering progress is exemplified by his commitment to various leadership roles in prominent organizations. As a current member of the board of directors of the Congressional Black Caucus Foundation (CBCF) and past service as Treasurer and chair of its Budget & Investment Committee, he actively contributes to advancing crucial issues within African American communities. Additionally, he currently serves on the board of directors of the Congressional Black Caucus Political Action Committee (CBCPAC), further amplifying voices and interests that demand attention.


As the immediate past president of the Washington Government Relations Group (WGRG), the African American lobbyists association, he championed diversity and inclusion within the industry. WGRG honored Marcus with the 2023 Lifetime Achievement Award at their signature event, the Tin Cup Awards, that Marcus founded.


Marcus's diverse talents extend beyond the realm of politics. His creative spirit is showcased through his captivating spy thrillers, published under the pen name Sebastian Cheney, captivating readers with thrilling narratives that parallel his own journey of strategic maneuvering and influence. Beyond his illustrious career, Marcus finds strength in his family. He is married to Christina Mary and takes immense pride in being the loving father of three children: Taelor Chanel, Romelo, and Grace Anne.

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