William J. Brennan

William J. Brennan is the founder of Brennan Law Offices and a Philadelphia criminal defense attorney handling serious state and federal matters. His practice includes criminal defense, appeals, domestic violence, drug charges, DUI defense, federal crimes, gun offenses, juvenile matters, parole and probation violations, sex crimes, theft, violent crimes, traffic violations, and white collar cases. He represents people facing high-stakes criminal allegations and prepares cases for negotiation, motion practice, hearings, trials, and appellate review.

William earned an LL.M. in Trial Advocacy from Temple University James E. Beasley School of Law in 2023 after receiving his J.D. from the same law school in 1987. He earned a B.S. from La Salle University in 1982. His advanced trial degree reflects continued study of courtroom advocacy after decades in practice. That academic background supports detailed preparation of witness examinations, evidentiary issues, trial themes, motion strategy, and other components of criminal defense litigation.

William has practiced law since 1987 and has built a long career centered on criminal defense and trial advocacy. His work spans misdemeanor and felony cases, federal investigations and prosecutions, DUI matters, violent crime allegations, financial and white collar charges, drug cases, firearms offenses, and post-conviction or appellate issues. He is a Fellow of the American College of Trial Lawyers, a credential associated with substantial trial experience and professional standing among courtroom advocates.

William J. Brennan has been selected to Pennsylvania Super Lawyers from 2006 through 2026 and was named among the Top 100 Pennsylvania Super Lawyers from 2023 through 2026. He was also listed among the Top 100 Philadelphia Super Lawyers from 2022 through 2026. His practice combines decades of courtroom experience with continued trial-advocacy training, helping clients address serious criminal accusations through careful investigation, strategic motion practice, negotiated resolutions, and trial when a case requires courtroom litigation.

Law Office Affiliations

• Founder, Brennan Law Offices
• Member, Pennsylvania Bar Association
• Fellow, American College of Trial Lawyers

Licensed State

• Pennsylvania

Education

• Temple University James E. Beasley School of Law
  Master of Laws (LLM) in Trial Advocacy
• Temple University James E. Beasley School of Law
  Juris Doctor (JD)
• La Salle University
  Bachelor of Science (BS)

Awards & Badges