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William (Bill) Pedersen


Senior Counsel

Bill Pedersen, senior counsel in the firm's Environment, Energy & Resources practice, is best known for his work on the Clean Air Act. He has been involved as a legislative and regulatory counselor, as a litigator, and as an expert witness in virtually every important Clean Air Act issue for the last 25 years, including new source review, Title V permits, amending air quality standards, hazardous air pollutant regulation, new source performance standards, fuels regulation, state implementation plans, the development and implementation of market based approaches, and enforcement of these provisions.  Much of this work has been done on behalf of the forest products, petroleum, and natural gas transmission and distribution industries. Congress has twice written suggestions in Bill's law review articles into the Clean Air Act.

As a member of the Breaking the Logjam Project,  Bill is taking a lead role in developing analytical support for the next round of Clean Air Act amendments, which will largely focus on simplifying the statute to obtain additional emission reductons - possibly including greenhouse gas reductions - at less cost. . 

Bill is also known as an innovative author and practitioner in environmental law and administrative law generally. He has extensive practice experience under RCRA, CERCLA and the Clean Air Water Act. 

Prior to joining Perkins Coie, Bill served as Deputy General Counsel and Associate General Counsel for Air and Radiation at the Environmental Protection Agency before becoming a partner at Shaw Pittman. Pedersen earned his law degree, cum laude, from Harvard Law School. He earned his undergraduate degree, magna cum laude, from Harvard College.

Professional Recognition

  • Listed in The International Who's Who of Business Lawyers: Environment
  • Listed in The Best Lawyers in America 1989 - Present: Litigation - Environmental
  • Listed in Washington D.C. Super Lawyers
  • Visiting Professor, University of Michigan Law School, 1997 - 1998 Academic Year
  • Lecturer in Law, Harvard Law School 1985

Related Employment

  • Shaw Pittman, Partner
  • Environmental Protection Agency, Deputy General Counsel and Associate General Counsel for Air and Radiation
  • Staff Counsel for Regulatory Reform, Senate Government Operations Committee
  • Ropes & Gray, Boston, MA
  • Sullivan & Cromwell, New York, NY


  • Hon. Henry Friendly, U.S. Court of Appeals for the Second Circuit


  • Harvard Law School, J.D., cum laude
  • Harvard College, B.A., Economics, magna cum laude

Bar Admissions

  • District of Columbia

Court Admissions

  • U.S. Supreme Court
  • U.S. Court of Appeals for the District of Columbia Circuit
  • U.S. District Court for the District of Columbia