Marty began his career in Massachusetts working for candidates running for public office at all levels of government – local, state, and federal. He joined Senator Ted Kennedy’s 2000 Senate campaign, later moving to his U.S. Senate Health, Education, Labor and Pension Committee in Washington, D.C. Marty returned to Massachusetts in 2005 to serve as Senator Kennedy's campaign manager for his successful 2006 election. He then joined Governor Deval Patrick’s Office of Housing and Economic Development as the Executive Director of the Massachusetts Office of Business Development in 2007. Through these experiences, Marty developed strong and trusted relationships with policymakers which persist today, and mastered the intricacies of the legislative and regulatory processes. 

After leaving government service, Marty founded Gateway Public Solutions in 2013, with the goal of providing a broad range of public affairs services to businesses, non-profit organizations, and candidates for public office. Over the past 10+ years, GPS has worked with dozens of clients to develop and implement strategic advocacy and political plans to protect and grow their businesses, achieve legislative goals, obtain critical public funding, win elections, pass ballot questions, and protect and grow organized labor in Massachusetts.