Daniel I. Booker Photo

Dan is a trial lawyer and a business counselor. His core antitrust and trade regulation practice includes counselling and litigation in mergers, acquisitions, price fixing, distributor relations, advertising, labor/antitrust, consumer banking, monopolization and franchising.  He has represented plaintiffs and defendants in civil antitrust litigation; defendants in criminal antitrust trials; targets of federal grand jury investigations; and distributors and manufacturers in dealer-termination cases.  He has represented both acquiring and acquired firms in friendly and hostile takeovers. 


  • University of Chicago Law School, 1971, J.D., Articles and Book Review Editor of Law Review; Order of the Coif
  • University of Pittsburgh, 1968, B.A.

  • District of Columbia
  • Pennsylvania

  • U.S. Supreme Court
  • All State and Federal Courts - District of Columbia
  • All State and Federal Courts - Pennsylvania

  • Academy of Trial Lawyers of Allegheny County
  • American Bar Association – Past Chair of the Antitrust Section Civil Practice and Procedure Committee; Associate Editor, Antitrust Magazine
  • Allegheny County Bar Association – Past Chairman of the Antitrust and Class Action Committee
  • Judicial Council of Pennsylvania
  • District of Columbia Bar Association – Vice Chair of the Antitrust Committee
  • Pennsylvania Bar Association
  • PA Lawyers Fund for Client Security –Chair
  • University of Chicago Law School – Member of the Visiting Committee (2008-2015)
  • Serves on the boards of directors of the Pittsburgh Parks Conservancy (Chair), Pittsburgh Civic Light Opera (former Chairman and founding Chair of its Academy of Musical Theater and Chair of the CLO Cabaret Theater) and The Committee for Mellon Square (co-chair)
  • Served as an officer or director of numerous business and community organizations, including RTI International Metals, Inc., the Allegheny Conference on Community Development (Executive Committee), the Pittsburgh Glass Center, the Greater Pittsburgh Council of the Boy Scouts of America, United Way of Southwestern Pennsylvania, the Community Investment Fund of the Mon Valley Initiative, the Pittsburgh Regional Alliance (Chairman), the Regional Air Service Partnership (Chairman), the Duquesne Club, the HYP-Pittsburgh Club (President), the American Civil Liberties Union, Penn’s Southwest Association (President), Océ-USA Holding, Inc., and HERC Development, Inc.
  • Served for many years as a member of the Allegheny County Democratic Committee


  • Selected through peer review for inclusion in The Best Lawyers in America© for Antitrust Law, Bet-the-Company Litigation, Commercial Litigation, Corporate Law, and Litigation - Antitrust, 1993-2021. He also received the Best Lawyers™ "Lawyer of the Year" award in Pittsburgh in 2011 for Antitrust Law, in 2013 for Corporate Law, in 2014 for Antitrust Law, and in 2015 for Litigation - Antitrust.
  • Ranked in Chambers USA for Pennsylvania Antitrust and Pittsburgh & Surrounds Litigation: General Commercial, 2003-2020.
  • The US Legal 500 – Dan has been included in the area of Mergers, Acquisitions and Buyouts within Antitrust - Northeast.
  • Selected for inclusion in the Pennsylvania Super Lawyers list for Antitrust Litigation, 2004-2020.