About William C.
William C. Kirby took a nontraditional route into the law. He graduated from the United States Naval Academy with a B.S. in 1998 and returned to academic life at Duke University School of Law, earning his J.D. in 2004. The early years after law school found him in uniform again, serving as a judge advocate for the U.S. Marine Corps. That experience shaped how he approaches cases and clients, and it remains a reference point in his work.
His civilian legal career spans military service, firm practice, and private practice. In 2004 he served as a military lawyer in the Marine Corps JAG Corps. A decade later he appears on records linked to Ansa|Assuncao LLP in 2014. By 2015 he was identified as a family law lawyer under his own name. Those moves reflect a career that has shifted between institutional roles and one-on-one client representation.
Kirby is admitted to practice in multiple jurisdictions. He holds admission in Pennsylvania, New Jersey, the District of Columbia and Maryland. His bar memberships include the New Jersey Bar Association, which he joined in 2016, and the Pennsylvania Bar Association’s Family Law Section, where his membership dates to 2014. He has also maintained membership in the Maryland Bar Association since 2004.
His practice record includes family law matters. The timeline of roles—military attorney, firm lawyer, and independent family law practitioner—suggests a mix of litigation and client counseling. He has worked in systems where procedure and hierarchy are central, and then moved to work that requires direct client contact and courtroom advocacy. That background gives him familiarity with both trial settings and negotiated resolutions.
Kirby maintains offices in Moorestown, New Jersey, and in Philadelphia. He divides time between those locations and between the matters that bring clients to him. Outside the courtroom, his memberships in state bar organizations keep him connected to changes in family law and to colleagues across state lines.
He remains active in practice and handles family law matters across the jurisdictions where he is admitted. His current practice focuses on family law representation in Pennsylvania and New Jersey.
