William B. Sullivan



William Sullivan is a partner with the law firm of Harris, Wiltshire & Grannis LLP. Mr. Sullivan is an accomplished litigator with experience from the earliest phases of a suit to post-judgment motions and appellate advocacy.

Civil Litigation:  Mr. Sullivan has represented numerous clients in civil litigation ranging from discrete pro bono matters to one of the largest civil cases in American history.  He is currently defending a large installer of fiber optic cable systems and several of its customers in litigation by plaintiffs threating the clients’ cable systems.  In Virginia state court, Mr. Sullivan represents a satellite company in a contract action with a large aerospace company involving the dissolution of their joint venture.  Mr. Sullivan has particular experience in disputes involving government procurement and contracting.  He has successfully defended winning bidders for government contracts in bid protest proceeding and related litigation. He is currently involved in defending claims pending in the United States District Court in the Northern District of New York alleging breach of a teaming agreement for a statewide fiscal agent project.

Investigations and Criminal Defense:  Mr. Sullivan has broad experience in conducting internal investigations for clients concerned about employee wrongdoing, defending clients facing government investigations, and criminal defense.  Recent matters include a defense of a corporate executive in a joint federal investigation by the Justice Department and the Securities Exchange Commission into an alleged international “pump and dump” scheme, which ended with the negotiation of a very favorable settlement.

Telecommunications:  Mr. Sullivan represents clients in the telecommunications industry, both in litigation and in proceedings before the FCC.  He successfully defended the selection of his client as the local number portability administrator in the D.C. Circuit, and has written comments on behalf of many major telecommunications companies and associations.

Mr. Sullivan clerked for the Honorable Margaret M. Morrow for the U.S. District Court for the Central District of California.  Prior to joining Harris, Wiltshire & Grannis LLP, he practiced at Munger, Tolles & Olson LLP in Los Angeles, where his work consisted primarily of general commercial litigation, white-collar litigation, and internal investigations.

Mr. Sullivan received his J.D. from Harvard Law School, cum laude, where he was the Chair of the Notes Committee of the Harvard Law Review.  He received his B.A., cum laude, from Yale University, where he graduated with a degree in English and Political Science.  A former journalist, Mr. Sullivan has written articles for U.S. News & World Report, the Financial Times Magazine, the St. Louis Post-Dispatch, and Philadelphia Magazine.


Harvard Law School, J.D., cum laude

Yale College, B.A., cum laude


Hon. Margaret M. Morrow, U.S. District Court for the Central District of California.



At HWG, we’re always looking for smart, talented people to add to our team.


  • 1919 M Street NW, Eighth Floor
    Washington, DC 20036-3537
  • By Appointment Only
    555 Fayetteville St., Suite 201
    Raleigh, NC 27601