Skip to content Michael J. Pietrykowski


Walnut Creek
100 Pringle Avenue
Suite 300
Walnut Creek, CA 94596

Los Angeles
633 West Fifth Street
52nd Floor
Los Angeles, CA 90071

5 Park Plaza
Suite 1100
Irvine, CA 92614

6781 N. Palm Avenue
Suite 102
Fresno, CA 93704


J.D.,University of Notre Dame , 1983

M.A., University of Notre Dame, 1980

B.A., University of Notre Dame, 1979


Best Lawyers in America® "Lawyer of the Year", Mass Tort Litigation / Class Actions - Defendants (2023)

Top Rated Lawyer-AV® Preeminent™, Martindale-Hubbell

Best Lawyers in America® distinction in Mass Tort Litigation / Class Actions - Defendants (2017-2024)

“Best Lawyers” in the San Francisco Bay Area in Environmental and Toxic Tort Law, The Bay Area Magazine

Super Lawyers® distinction in the fields of Environmental Litigation, Class Action/Mass Torts (2009-2018, 2020-2023, Law & Politics)

Co-Chair, HB National Asbestos Conference (San Francisco, 2009; New York, 2010)


Mike Pietrykowski’s practice focuses on toxic tort and environmental matters.  He has been the Chair of GRSM’s Environmental and Toxic Tort practice group for more than fifteen years. He serves as both National and Regional Counsel for defendants, regularly appearing in courts throughout the U.S. Mike is a very active participant in a national industry focus group and, as such, participates in thought leadership discussions involving defense strategies for a sector of toxic tort litigation.  He has also handled a wide variety of toxic tort cases including those involving chemicals, asbestos and mold exposures.

He has experience with all major environmental statutes including the Resource Conservation and Recovery Act, the Comprehensive Environmental Response, Compensation and Liability Act (Superfund), and California’s Proposition 65. He has also represented defendants in personal injury, products liability and professional liability cases. He has spoken at numerous regional and national seminars on topics such as the chemical, asbestos, and mold litigation and the use of experts in environmental cases.

Prior to joining GRSM in 1984, Mike worked for several years as a sports attorney representing professional athletes. In that capacity, he acquired extensive contract negotiation experience.


  • California
  • Connecticut


  • Association of Defense Trial Attorneys
  • Defense Research Institute
    • Former California Liaison, DRI Environmental and Toxic Tort Subcommittee
  • Midwest Environmental Claims Association
    • Former co-chair, Midwest Environmental Claims Association, Public Relations Committee
  • American Bar Association
  • Connecticut Bar Association
  • California Bar Association
  • San Francisco Bar Association
Publications & Presentations