Mark Sullivan is a Co-Founder of GSIS. Prior to entering private life, Mr. Sullivan was the Director of the United States Secret Service (USSS) and served in a variety of leadership roles as a Special Agent 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, risk management, human capital management, technology deployment, and budget development and execution. As Director, he managed 7,000 Special Agents, Uniformed Division Officers, and Administrative, Professional and Technical staff members and oversaw an annual budget of nearly $1.7 billion. During his tenure at the USSS, he was the responsible for the protection of five presidents and thousands of visiting heads of state, oversaw 40,000 protective stops, prevented nearly $20 billion in potential financial crime losses, seized over $1.1 billion in counterfeit currency and arrested more than 50,000 suspects for violation of federal statutes.

Additionally, he was responsible for the security of two Presidential Campaigns, 22 National Special Security Events, and seven United Nation General Assemblies. Mr. Sullivan began his career in Federal law enforcement nearly 35 years ago as a Special Agent with the Housing and Urban Development (HUD) Inspector General for Investigations. His leadership and professional integrity at the Secret Service has been recognized by numerous awards including two Distinguished Presidential Rank Awards, a Department of Homeland Security (DHS) Secretary’s Award and the Department’s Gold Medal for Distinguished Service, the highest civilian award presented by DHS.  Mr. Sullivan supports the development of the next generation of law enforcement leaders as National Chairman of Law Enforcement Explorers, and serves on the Board of Directors of Heroes.

Mr. Sullivan is a graduate of St. Anselm College, Manchester, NH and is a guest lecturer at the John F. Kennedy school of public health.