Matthew P. Cullen is president and chief operating officer of Rock Enterprises, an umbrella entity formed to provide operational coordination, guidance, and integration for Dan Gilbert's portfolio of companies and investments.  Cullen also has responsibility for Gilbert's "Detroit 2.0" initiative, which is an effort to spark development in downtown Detroit.

Cullen is a 29-year veteran of General Motors (GM) where he was General Manager of Economic Development and Enterprise Services.  In addition to coordinating economic development initiatives in the communities in which GM operates, he created a shared services organization and had responsibility for the corporation's vast 450 million-square-foot global real estate portfolio.

A native Detroiter, Cullen was chief architect of GM's $500 million acquisition and development of the Renaissance Center as GM's global headquarters, and the billion dollar redevelopment of the Detroit Riverfront.  He is founding chairman of the Detroit Riverfront Conservancy and was appointed by Michigan Governor Jennifer M. Granholm to the Michigan Economic Development Corporation (MEDC) Executive Committee, which he chairs.

In addition to chairing the MEDC Executive Committee, Cullen serves as Chairman of the Detroit Investment Fund, the Parade Company and the Metropolitan Detroit YMCA; Vice Chair of Downtown Detroit Partnership; former chair of the Metropolitan Detroit Convention and Visitors Bureau; and is on numerous charitable and educational boards.

Cullen earned a degree in economics from the University of Michigan and an MBA from the University of Detroit Mercy.  He also completed the Senior Executive Program at Harvard University.

He resides with his wife Karen and their three sons in metro Detroit.