Lonnie's exceptional commitment to understanding his client’s businesses and prioritizing his client's goals makes him a trusted advisor and counselor.


Lonnie is a nationally recognized trial lawyer, defending clients in all aspects of their businesses in courts throughout the United States. He focuses his practice on representing large companies in discrimination lawsuits and in intellectual property cases. Recognized for excellence by his clients and peers, Lonnie’s track record of success with judges, juries and arbitrators across the country gives him an edge in the courtroom and in other settings.

A fellow of the American College of Trial Lawyers, one of the premier legal associations in America, Lonnie takes cases to trial and obtains verdicts on behalf of his clients. Those lawsuits include sex discrimination, retaliation, age discrimination, breach of contract, defamation, religious discrimination and other statutory and common law claims. He also has extensive experience in representing clients in trademark and non-competition matters including prosecuting the landmark Arizona case, Valley Medical Specialists v. Farber. He has also handled class action FLSA cases in more than 15 jurisdictions around the country.


Successfully defended a national client against FLSA class action claims in California

Successfully handled a number of appeals relating to class action FLSA claims including appeals in state court in California and federal court in Alabama, Colorado and Georgia

Obtained a summary judgment dismissal in a rare Equal Pay Act claim

Successfully enforced an arbitration agreement and the dismissal of class claims in state court in California

Obtained a jury verdict in favor of a national client against claims of national origin discrimination brought by two separate plaintiffs

Obtained summary judgment dismissal in favor of a national company filed by a trucking trade group seeking to assert a class action under the regulations of the Federal Motor Carrier’s Safety Administration

News & Insights




Named to the Lawyers of Color "Nation's Best" list within the inaugural Law Firm Leaders issue, December 2022

Co-presenter at 2016 Arizona SHRM Conference, September 2016

AZ Business Leaders 2016

The Best Lawyers in America©, Commercial Litigation, Labor and Employment Law, 1995 - Present

Chambers USA®, Labor & Employment (2003-present): "Sources enthusiastically endorse Lonnie Williams of Stinson Leonard Street as 'unquestionably one of the best trial lawyers in the state.' He focuses his practice on representing large companies in discrimination lawsuits."

Profiled in AZ Business Magazine, AZ Business Leaders Issue, October 2013

Most Admired Leaders, Phoenix Business Journal, May 2014

Top 25 Minority Leaders in AZ Business Magazine, 2014

Southwest Super Lawyers, Business Litigation, Employment & Labor, 2007 - Present

"Top 100 Most Powerful Employment Attorneys," Human Resource Executive Magazine and Lawdragon™, 2010 - 2011

Professional & Civic Activities

Professional & Civic Activities

American College of Trial Lawyers, Fellow

National Conference of Bar Presidents, Former President

American Bar Association, Former Delegate

Maricopa County Bar Association, Former President


  • Arizona, 1979
  • U.S. Supreme Court, 2008
  • U.S. Court of Appeals for the Seventh Circuit, 2011
  • U.S. Court of Appeals for the Tenth Circuit, 2011
  • U.S. Court of Appeals for the Sixth Circuit, 1989
  • U.S. Court of Appeals for the Ninth Circuit, 1988
  • U.S. District Court for the District of Colorado, 2003
  • U.S. District Court for the District of Arizona, 1979


Yale University, J.D., 1979

University of Arizona, B.S., with highest distinction, 1976

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