William A. Isaacson

Bill Isaacson, a partner in the Litigation Department of Paul, Weiss, Rifkind, Wharton & Garrison LLP, is widely considered one of the most preeminent litigators of his generation. A Fellow of the American College of Trial Lawyers, Bill was named a “Litigator of the Year” in 2016 and a “Litigator of the Week” three times by The American LawyerChambers has called Bill a “celebrated trial lawyer” who is “highly recommended for his work in complex class actions.”

Bill has successfully represented both plaintiffs and defendants in major antitrust litigations; of the approximately dozen federal antitrust class actions that have gone to trial and judgment in this century, he has tried five of them, winning verdicts in each case. Global Competition Review has noted that “arguably no antitrust lawyer in recent memory has had as much success for both plaintiffs and defendants as Bill Isaacson.” Lawdragon writes that it is “nearly impossible to find a more reliable antitrust litigator than Isaacson, who has successfully handled several of the most high-profile cases in the past two decades.”

Bill has achieved numerous industry awards over the years. Bill is among only 31 lawyers to be named in the Lawdragon 500 each of the last 10 years; Law360 has twice named Bill a “Competition MVP” and also has named him as a “Titan of the Plaintiff Bar.” Global Competition Review has named him a “Litigator of the Week.” In college, he was a finalist at the 1982 National Debate Tournament.

Bill has spoken and presented regularly at legal conferences, including NYU Law School’s conference on Antitrust and 21st Century Bigness, the ABA’s American Judicial Law Institute for Antitrust (sponsored by University of California at Berkeley and the University of Chicago), the American Antitrust Institute, the Sedona Conference, and MLEX Advisory Board, as well as conducted mock trials for the Spring and Fall ABA Antitrust Conferences and the ABA Economics Institute for Judges at George Mason University.

Bill is a member and former Chair of the Board for Legal Counsel for the Elderly. In 2015, the group recognized him with its individual Award for Sustained Excellence and Outstanding Commitment. His pro bono work was featured in articles in the Washington Post in 2010 and 2017.