PETER D. KEISLER, a former Acting Attorney General of the United States and a co-chair of Sidley’s Appellate practice, has successfully represented some of the country’s largest companies in the telecommunications, transportation, energy and healthcare industries, as well as a host of national trade associations, providing extensive insight and experience gained from his more than 25 years of private and public sector experience. Including him in its top-tier of the nation’s appellate lawyers, Chambers USA 2014 notes that clients told the directory that Peter “is one of the top appellate litigators in the country at this time. He has incredible mastery of appellate argument, and how to submit the most compelling case to federal judges.”

Peter has argued a wide range of federal constitutional, statutory, and administrative law cases. His practice representing clients before the United States Supreme Court, federal courts of appeals and federal district courts has included the leading role in the nation’s most important energy lawsuits of the past several years, including UARG v. EPA, AEP v. Connecticut, EME Homer City Generation LP v. EPA, and United States v. Cinergy Corp.