Robert S. Arns

Founding Partner

For the last 38 years, Bob has prosecuted personal injury and class action cases. His practice has ranged from cases involving banking issues, online rights of privacy, employment cases, various consumer goods and services, skilled nursing care, and various other fields. Bob is inspired and gratified by representing all his clients, from construction workers, to classes of consumers, to top executives at Fortune 100 corporations. He has resolved over 400 million and multi-million dollar cases, tried over 60 cases, and argued numerous appeals in front of the California Supreme Court, 9th Circuit Court of Appeals, and California Appellate Courts

Bob’s dream – his experiment – in founding The Arns Law Firm, in San Francisco in December 1996, is being fulfilled beyond his expectations. Bob has also been a Professor of Law at the University of San Francisco School of Law teaching trial practice to 3rd year law students for 15 years and is a frequent lecturer on legal topics involving tort law, trail practice, evidence, class actions, civility, and others.

Practice Areas

Construction Injury

Wage & Hour

Personal Injury

Consumer Law

Elder Abuse


University of San Francisco School of Law (1975)

Juris Doctor, cum laude

University of California, Santa Barbara (1971)

B.A. English Literature, Highest Honors


America's Top 100 Attorneys Lifetime Achievement Award

The National Trial Lawyers Top 100 Civil Plaintiffs Lawyers

AV Preeminent Rating by Martin-Hubbell

San Francisco Trial Lawyer of the Year

California Trial Lawyer of the Year

"Top 100” Super Lawyers in Northern California

The Best Lawyers in America©

Best-selling author of Rutter Group's The California Evidence Wheel©; The California Trial Wheel©; The Federal Evidence Wheel©; and The Federal Trial Wheel©

University of San Francisco School of Law Professor of the Year and Co-Alumni of the Year

Publications and Presentations

August 2017: SFTLA MCLE “Trial Skills”


December 2017: Bar Association of San Francisco, “Civility Matters”, San Francisco

November 2017: Alameda County Bar Association MCLE, “Trial Persuasion”

September 2017: Northern California Laborers, “Modified Duty”

August 2016: SeminarWeb Live – “Becoming an Evidence Master”

November 2015: SFTLA MCLE “Presenting Evidence Practicum”

August 2014: SFTLA MCLE, “Evidence in Trial”

July 2014: SeminarWeb Live – “How to be Successful At Obtaining and Maximizing Non-Economic Damages”