From 2010 to 2018, Martinez served as the New Jersey Motor Vehicle Commission Chair and Chief Administrator in the Cabinet of Governor Chris Christie.In President Ronald Reagan's administration, he was Deputy Director for Scheduling and Advance at the White House for First Lady Nancy Reagan and also served as a Special Assistant at the New York Regional Office of the United States Department of Housing and Urban Development.On February 1, 2010, Martinez was nominated to the position of Chief Administrator of the New Jersey Motor Vehicle Commission by Governor Chris Christie and he was confirmed by the State Senate.In 2019 Martinez was appointed a Senior Advisor at the Department and tasked with overseeing the redevelopment of the John A. Volpe National Transportation Systems Center in Cambridge, MA for the USDOT.The initiative is a $750 million project coordinated between the USDOT, the U.S General Services Administration and the Massachusetts Institute of Technology intended to deliver a new national research center for the Department of Transportation and add new development on a central 14-acre (5.7 ha) parcel in the middle of the Kendall Square neighborhood of Cambridge.