Four Penn Center
Suite 900
1600 JFK Boulevard
Philadelphia PA, 19103

267.528.0739 (direct)
919.225.2907 (mobile)
267.528.0726 (fax)

William C. Kirby


In June 2014, Bill joined Ansa Assuncao after serving for 10 years as an attorney in the United States Marine Corps.  Bill's diverse civil practice is nationwide in scope and includes the defense of personal injury claims as well as product liability and commercial disputes.  His representative clients include transportation, manufacturing, elevator and escalator companies for whom he defends wrongful death, catastrophic personal injury and property damage claims. 

Bill built the foundation of his extensive litigation experience in the United States Marine Corps as a career military litigator.  During his military career, he served as a trial defense counsel, an appellate government counsel and a trial counsel for the Military Commissions (September 11th terror suspect trials).  Bill has litigated a full spectrum of criminal matters to include capital crimes, sexual assaults, larceny and drug trafficking offenses.  Due to his broad experience, he was frequently consulted by lawyers and commanders throughout the Department of the Navy, and has guest lectured at the Naval Justice School.  As a civil litigator for Ansa Assuncao, Bill’s experience has proven invaluable as he has repeatedly achieved successful outcomes for clients involved in personal injury actions, insurance coverage and bad faith claims, product liability disputes and transportation litigation.

Education and Admissions


District of Columbia
U.S. District Court for the Eastern District of Pennsylvania 
Navy-Marine Corps Court of Criminal Appeals
United States Court of Appeals for the Armed Forces


J.D., Duke University School of Law (2004)
B.S., U.S. Naval Academy (1998)

Prior Affiliations

United States Marine Corps, Major (Ret.) (1998-2014)

Select Decisions

  • United States v. Mott,
    72 M.J. 319 (Court of Appeals for the Armed Forces (C.A.A.F.) 2013) 
  • United States v. Lubich,
    72 M.J. 170 (C.A.A.F. 2013)
  • United States v. Tearman,
    72 M.J. 54 (C.A.A.F. 2013) 
  • United Sates v. Caldwell, 
    70 M.J. 630 (Navy-Marine Corps Court of Criminal Appeals 2011)