Areas of Practice
  • Yale Law School, J.D., 1980
  • University of North Carolina, Chapel Hill, B.A., 1977
Judicial Clerkships
  • Hon. Robert R. Merhige, Jr., US District Court for the Eastern District of Virginia, 1981-1982
Bar & Court Admissions
  • District of Columbia

William T. Hassler

1330 Connecticut Avenue, NW
Washington DC 20036
TEL: +1 202 429 6469
FAX: +1 202 429 3902

William T. Hassler is a partner in Steptoe's Washington office, where he is a member of the Litigation Department.  His practice has encompassed a broad range of criminal and civil cases, including numerous matters resolved by trial in both state and federal courts.  Prior to joining the firm, Mr. Hassler served as a prosecutor for the Office of Independent Counsel investigating the Iran/Contra affair, and in the Environmental Crimes Section of the US Department of Justice.  He is a former Special Assistant to the Director of the Federal Bureau of Investigation (FBI).

Civil Litigation
Mr. Hassler’s practice has included a large variety of civil disputes, including Commerce Clause issues, ERISA claims, and numerous environmental coverage matters.  He has addressed civil claims arising out of alleged corporate misconduct, including the defense of Tyco’s former general counsel, and has represented insurers in numerous coverage disputes involving environmental liabilities, September 11 claims, and other types of coverage.  His experience includes defense of claims by national manufacturing companies, chemical companies, and petroleum products companies.

White-Collar Criminal Defense
Mr. Hassler has represented numerous companies and individuals subject to criminal investigation.  He has handled cases involving alleged corporate misconduct, complex environmental matters, charges of healthcare fraud, the regulation of medical devices, and the representation of witnesses subject to investigation by Congressional committees.

Select News & Events

Selected Publications

  • Congressional Oversight of Federal Environmental Prosecutions; 24 Envir'tl Law Rev. 10074
    February 1994
  • Co-Author, Coal and the Clean Air Act ; Yale Press

Professional Affiliations

  • American Bar Association, Litigation Section; Section of Natural Resources, Energy and Environmental Law