William H. Difenderfer
With more than four decades of experience, William H. Difenderfer is among the most respected and recognized criminal attorneys in Southwestern Pennsylvania — a legacy built by guiding and advocating for his clients, always fighting to achieve the best possible outcome.
Unlike attorneys who rely on advertising, Bill built both his reputation and his practice the hard way — in the courtroom — believing that true success comes from delivering results, earning client trust, and growing through referrals. With trial experience spanning nearly every facet of criminal law, Bill brings deep expertise to high-stakes litigation, including over 100 homicide trials and 9 capital cases.
Raised in Pittsburgh and a graduate of Chartiers Valley High School, Bill attended Westminster College and Ohio Northern Pettit College of Law. He put himself through law school by working at U.S. Steel’s Edgar Thomson Steel Works in Braddock, PA. His lifelong connection to this region gives him a deep understanding of the community — insight he brings to every case. Throughout his career, Bill has built strong relationships with courts, district attorney offices, and police departments across Southwestern Pennsylvania, professional connections that have consistently helped him achieve favorable outcomes for his clients.
Beyond the courtroom, Bill’s involvement with high-profile cases has contributed to his presence in the media, both in Pittsburgh and nationally. Valued for his legal perspective, he is a trusted media contributor with regular appearances on local radio and television, including KDKA and the Marty Griffin Show, as well as in print.
Bill was part of the first group of criminal lawyers inducted into the prestigious Academy of Trial Lawyers of Allegheny County, a limited membership organization that upholds the highest standards of integrity and competence in the profession. Named a Super Lawyer based on peer nominations, professional achievement, and independent research, Bill’s selection highlights his exceptional skill and lasting impact on the legal field.
