Atty. R. Brent Wisner
Attorney R. Brent Wisner is a managing partner of Wisner Baum (formerly Baum Hedlund Aristei & Goldman), a nationwide law firm based in Los Angeles, California.
Profile Summary
About R. Brent Wisner at a glance
R. Brent Wisner is a personal injury, product liability, and consumer attorney based in Greenbrae, California, practicing at Wisner Baum PC. They have 15+ years of legal experience, licensed to practice since 2011. Admitted to practice in California (2011). Educated at Georgetown University (—, 2010) and Georgetown University (—, 2010). Recognitions include Best Lawyers in America — Personal Injury Litigation - Plaintiffs (2026), Best Lawyers in America — Product Liability Litigation - Plaintiffs (2026), and Best Lawyers in America — Consumer Protection Law (2026). Serands clients in Greenbrae, CA and the surrounding metropolitan area.
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About
- Attorney R. Brent Wisner is a managing partner of Wisner Baum (formerly Baum Hedlund Aristei & Goldman), a nationwide law firm based in Los Angeles, California
- He focuses his practice on holding negligent and sometimes malicious corporations accountable through pharmaceutical product liability, toxic torts and consumer fraud and class action litigation
- One of the firm’s leading trial lawyers, Brent oversees the mass tort litigation department
- He is actively involved in all litigation stages, from briefing to trial and through the appeal process when necessary.He is passionate about vindicating the rights of those harmed by corporate wrongdoing
- No matter how large the corporation or how much global influence it has, Attorney Wisner never backs down in the face of injustice
- He has litigated cases against such companies as Bayer, Eli Lilly, Forest Labs, GlaxoSmithKline, Monsanto and Takeda.Attorney Wisner’s work in the Monsanto Roundup litigation earned him national acclaim as the youngest United States attorney in history to ever win a multi-billion-dollar jury verdict
- In 2019, Brent and his team won a historic $2.055 billion verdict against Bayer (formerly Monsanto) for a California couple that alleged repeated exposure to Roundup weed killer caused them to develop non-Hodgkin’s lymphoma.A year prior, Brent and his team won the first Roundup case to proceed to trial, a landmark $289 million jury verdict for a California man who developed non-Hodgkin’s lymphoma after years of spraying Roundup as a groundskeeper.Many major legal organizations have recognized Brent and showered him with numerous awards honoring his achievements in the Roundup cancer litigation
- Some of his top awards include, the “Clarence Darrow Award” by MTMP, “West Trail Blazer” by ALM, Law360’s “MVP of the Year” 2020, Daily Journal “Top 100 Lawyers in California” 2020, ALM and the National Trial Lawyers’ “2019 Civil Plaintiff Trial Lawyer of the Year,” the National Law Journal’s “Winning Litigators-Titans of Industry 2019” and Trial Lawyer Magazine “America’s 50 Most Influential Trial Lawyers” 2019
- He was also inducted into ALM’s “Verdicts Hall of Fame.”Attorney Wisner also served as co-lead counsel in the first multi-million-dollar jury verdict won against a brand name drug manufacturer, GlaxoSmithKline (GSK), over the health risks posed by the generic version of GSK’s antidepressant drug, Paxil (paroxetine).When the firm learned of a widow whose husband died by suicide while taking the generic version of Paxil, Attorney Wisner and his colleagues at the firm took on GSK for inadequately warning doctors about how the drug could increase the risk of suicidal behavior in adults of all ages
- In 2018 the National Law Journal honored Attorney Wisner and his firm as Elite Trial Lawyers for their work in the generic Paxil suicide case and Law360 awarded him “Titan of the Plaintiffs Bar.”His work in pharmaceutical litigation does not stop at harmful antidepressant medications
- Attorney Wisner is one of the nation’s leading Zantac (ranitidine) attorneys
- He represents many thousands of people throughout the country who allege Zantac (ranitidine) contains a cancer-causing ingredient at levels exponentially higher than the U.S
- Food and Drug Administration’s (FDA’s) legal limit.The judge presiding over the Zantac multidistrict litigation (MDL) appointed Brent to the Practices and Procedures Team to establish protocols for handling the thousands of cases to come
- Brent also serves as Co-lead Plaintiffs’ Liaison Counsel for the Ranitidine Product Cases, also known as the Ranitidine (Zantac) Judicial Council Coordinated Proceedings (JCCP 5150), California Superior Court for the County of Alameda
- He also serves as the American Association for Justice (AAJ) Zantac Litigation Group Co-Chair.Often chosen as one of a select group of remarkable trial lawyers with victories in high-stakes matters, Attorney Wisner is grateful for the many awards and accolades he has won in the early stage of his career
- Not yet in his 40’s, Brent is viewed by many in the legal community as one of the country’s leading mass tort lawyers
- The National Law Journal and VerdictSearch inducted him into the Verdicts Hall of Fame in 2020.Just a portion of his recognitions from the past few years include the following: • Clarence Darrow Award, MTMP-Mass Torts Made Perfect, 2021 • Consumer Attorney of the Year, Finalist 2021, Consumer Attorneys of California • California Powerhouse, Law360 Regional Powerhouse Series, 2021 • The American Lawyer’s West Trailblazers, 2021 • America’s 50 Most Influential Trial Lawyers 2019, Trial Lawyer Magazine and The National Law Journal • MVP of the Year 2020, Product Liability, Law360 • Product Liability Practice Group of the Year 2020, Law360 • The Best Lawyers in America© 2021-2022 • The National Trial Lawyers: Top 40 under 40 • Top 40 Under 40 Attorneys in California, 2019, Daily Journal • Civil Plaintiffs Trial Lawyer of the Year 2019, National Trial Lawyers and ALM • Top 100 Lawyers in California 2020, Daily Journal • Top Plaintiffs Lawyers in California, 2019, Daily Journal • Verdicts Hall of Fame Inductee, The National Law Journal and VerdictSearch • Elite Trial Lawyers Mass Tort Trial Team of the Year 2019, The National Law Journal and Trial Lawyer Magazine • Southern California Super Lawyers® Rising Stars, 2016–2020 • Winning Litigators 2019, The National Law Journal • Titan of the Plaintiffs Bar 2018, Law360 • Superb Score 10 out of 10 • Lawdragon 500 Leading Plaintiff Consumer Lawye Attorney Wisner earned his bachelor’s degree in philosophy and political science from the University of California, Los Angeles, his master’s degree in public policy from Georgetown McCourt School of Public Policy, Washington, D.C., and his law degree from Georgetown University Law Center, Washington, D.C.A proud UCLA Bruin, Brent served as captain of UCLA’s Mock Trial Team, which won back-to-back national championships under his leadership.At Georgetown, Attorney Wisner was a participant in the Coro Fellowship, which proved to be a formative experience
- As a fellow, he was able to work on numerous projects aimed at improving communities with the help of labor unions, Fortune 100 companies, non-profits, and local and federal governments
- When he returned home for summer breaks, he worked at the U.S
- Attorney’s Office in its civil fraud division and as a summer associate at Paul Hastings.While in law school, Brent interned at the Institute on Religion and Public Policy, where he drafted testimony, affidavits, and declarations for human rights cases
- He penned a resolution on the imprisonment of outspoken human trafficking critic Sigma Huda, which passed in the House of Representatives
- Brent was also intensely involved in the Georgetown Law Trial Advocacy Program
- He earned the title of being one of the institution’s most successful mock trial advocates and ended up serving as its managing director.Before joining Wisner Baum, Attorney Wisner clerked for the Honorable Helen Gillmor in the U.S
- District Court for the District of Hawaii, where he worked on several criminal and civil jury trials and gained invaluable appellate court experience when the judge sat on the U.S
- Court of Appeals for the Ninth Circuit
Practice Areas Explained
R. Brent Wisner's Areas of Practice
Each practice area below reflects the types of cases R. Brent Wisner handles, with a brief overview of what that area of law covers.
Personal injury attorneys help accident victims recover compensation for medical bills, lost wages, and pain & suffering. Most work on contingency — no fee unless you win.
R. Brent Wisner is one of 264,852 personal injury attorneys indexed nationally. Browse personal injury attorneys in California →
R. Brent Wisner is one of 66,193 product liability attorneys indexed nationally. Browse product liability attorneys in California →
Consumer protection attorneys for fraud, lemon law, debt harassment, and deceptive trade practices.
R. Brent Wisner is one of 50,607 consumer attorneys indexed nationally. Browse consumer attorneys in California →
Jurisdictional Context
Why local counsel matters in California
Practicing law in California. Legal matters in California are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Greenbrae are typically filed in the local municipal court or the appropriate California state district court, depending on subject matter and amount in controversy. An attorney licensed in California brings working knowledge of local procedural deadlines, judicial practices in this andnue, and the substantive law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in California courts without local counsel or pro hac vice admission.
Looking for additional California attorneys? Browse all attorneys in Greenbrae or all attorneys in California.
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