Mark Sullivan

Mark Sullivan was formerly a Principal at GSIS. Prior to co-founding GSIS, Mr. Sullivan was a federal law enforcement agent for nearly 35 years. Mr. Sullivan concluded his federal service as the Director of the United States Secret Service (USSS), beginning as an entry level field agent and ultimately serving in a variety of leadership roles in the organization for nearly 30 years. As an effective and strategic chief executive, Mr. Sullivan led high impact initiatives in criminal investigations and protective operations, strategic planning, threat assessment and risk management, human capital management, technology deployment, IT modernization and budget development and execution. At GSIS, Mr. Sullivan works with clients on a variety of domestic and international security issues including financial and intellectual property investigations, business due diligence, major event planning, security vulnerability assessments for sports venues, buildings and critical infrastructure, risk management consultation, and security training and executive protection. Mr. Sullivan also chaired a panel of security experts, convened by the US Department of State, which was charged with identifying best security practices when operating in high threat areas. Mr. Sullivan currently serves on the Board of Directors for Uber, LiveSafe and Evolv Technology. Mr. Sullivan is a graduate of St. Anselm College, Manchester, NH. He is a graduate of the Senior Executive Fellows program at Harvard’s John F. Kennedy School of Government.