Maryland Department of Transportation

The Maryland Department of Transportation (MDOT) is an organization comprising five business units and one Authority:


 * Maryland Transportation Authority (Transportation Secretary serves as chairman of the Maryland Transportation Authority)
 * Maryland Transportation Authority Police
 * Maryland Transit Administration
 * Maryland Transit Administration Police
 * Maryland Port Administration
 * State Highway Administration
 * Maryland Motor Vehicle Administration
 * Maryland Aviation Administration

Secretaries of Transportation

 * 2023–present, Paul Wiedefeld
 * 2022–2023, James F. Ports Jr.
 * 2020–2022, Gregory I. Slater
 * 2015–2020, Pete K. Rahn
 * 2013–2015, James T. Smith Jr.
 * 2012–2013, Darrell Mobley (Acting Secretary)
 * 2009–2012, Beverley K. Swaim-Staley
 * 2007–2009, John D. Porcari
 * 2003–2007, Robert L. Flanagan
 * 1999–2003, John D. Porcari
 * 1995–1998, David L. Winstead
 * 1991–1994, O. James Lighthizer
 * 1987–1991, Richard H. Trainor
 * 1984–1987, William K. Hellmann
 * 1981–1984, Lowell K. Bridwell
 * 1979–1981, James J. O'Donnell
 * 1977–1979, Herman K. Intemann
 * 1971–1977, Harry R. Hughes