• Ph.D., University of Wisconsin, 2000
  • J.D., Stanford Law School, 2000, with distinction
  • M.A., University of Montana, 1995
  • Fulbright Fellow, Université de Saint-Louis, Sénégal, 1994
  • B.A., University of Montana, 1993, with high honors
  • Defense Language Institute, 1991, Top Graduate (Russian)
  • California
  • U.S. District Courts for the Southern, Central, Northern and Eastern Districts of California
Thought Leadership


Dr. Shannon Petersen is a business litigator and the Managing Partner of the San Diego (Del Mar) office. He co-leads the firm’s TCPA and Consumer Class Action Defense Teams.

Areas of Practice

Shannon is a trial attorney specializing in consumer class action defense and complex commercial disputes. He has successfully represented clients in claims involving:

  • Telephone Consumer Protection Act (TCPA)
  • Fair Debt Collection Practices Act (FDCPA) and California Rosenthal Act
  • Fair Credit Reporting Acting (FCRA)
  • Truth in Lending Act (TILA)
  • California's Unfair Competition Law (UCL)
  • California’s Consumers Legal Remedies Act (CLRA)
  • California’s Automatic Renewal Law (ARL)
  • Privacy and call recording statutes
  • Automobile Sales Finance Act (ASFA or Rees-Levering)
  • Other business claims, including breach of contract, misappropriation of trade secrets, defamation, unfair business practices, false advertising, fraud, breach of fiduciary duty, negligence, wrongful foreclosure or repossession, unfair debt collection, etc.

Shannon represents clients in a variety of industries, including financial services, retail and healthcare, among others.


  • 2019, Recommended by The Legal 500 US for Cyber Law
  • 2013, Certificate Of Recognition for Pro Bono Services from the U.S. District Court for the Southern District of California
  • 2008, Recognized as a "Top Young Attorney" in San Diego by The Daily Transcript
  • 2007, 2003, and 2002, California Bar Association Wiley Manuel Award for Pro Bono Legal Services
  • 2003, Nominee, California Bar Association President's Pro Bono Service Award, Recently Admitted Category
  • 2002-2003, San Diego Volunteer Lawyer Program Distinguished Service Award
  • 1992, Honorable Discharge, U.S. Navy, Russian linguist


Representative Clients

  • Rite Aid
  • Walmart
  • San Diego County Credit Union
  • Toyota Financial
  • Wells Fargo
  • Liberty Mutual
  • IEC Corporation
  • HMS Holdings/Eliza Corporation

Recent Litigation Successes

  • Victory following two jury trials, one bench trial and four arbitrations.
  • Won several motions for summary judgement.
  • Dismissals of many TCPA privacy class actions following motions.
  • Obtained nearly $8 million in settlement for a plaintiff business in a misappropriation of trade secrets case.
  • Obtained terminating sanctions and default judgment against a defendant in a defamation case for destroying evidence.
  • Defeated class certification and obtained outright dismissal in late fee class action.
  • Compelled arbitration and enforced a class action waiver in many cases.

Thought Leadership



  • Author, Acting for Endangered Species: The Statutory Ark, Development of Western Resources Series, Kansas University Press, 2002 (hardcover), and 2007 (paperback). Favorably reviewed by The Journal of American History (June 2003); History: Reviews of New Books (Summer 2003); Perspectives on Political Science (Summer 2003); Environmental History (April 2003); Stanford Environmental Law Journal (January 2003); Animal Keeper's Forum (2003); and Choice (December 2002)
  • Contributor, Dictionary of American History, Third Edition, Charles Scribner's Sons, 2002. Contributed essays on the Clean Air Act of 1990, the Clean Water Act of 1987, the Occupational Safety and Health Act, the Environmental Protection Agency, the Sierra Club and the Highway Beautification Act
  • Co-author, The Endangered Species Act, Stanford University Press, 2001

Speaking Engagements

  • Presenter, “What You Need To Know About Attorney Client Privilege,” Dallas, TX, October 2019
  • Presenter, “The Telephone Consumer Protection Act,” Long Beach, CA, September, 2016
  • Presenter, “What Does The Telephone Consumer Protection Act (TCPA) Mean For Financial Institutions?” Long Beach, CA, January, 2016
  • Presenter, "Effective Arbitration," The Association of Business Trial Lawyers, San Diego, CA, September 2014
  • Organizer and Presenter, Association of Business Trial Lawyers Trial Skills Seminar, San Diego, CA, October 2012, 2010, and 2008
  • Speaker, Continuing Legal Education Presentation on Receiverships, San Diego, CA, August 2008
  • Shannon has taught courses at the University of Wisconsin, Madison, and the University of Montana, Missoula


  • American Financial Services Association
  • Pro Se Panel of the U.S. District Court for the Southern District of California
  • Association of Business Trial Lawyers, San Diego (former member of Board of Governors)
  • Editorial Board of the Association of Business Trial Lawyers Report, San Diego (former)
  • Barrister, Louis M. Welsh Chapter of the American Inns of Court (former)
  • State Bar of California and San Diego County Bar Association