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No Fees Unless We Win 855-948-5098
Nationwide justice Client Focused. Trial Ready. Billions Won.


  • $2.0 Billion Verdict Personal Injury

    In May of 2019, the jury in the case of Pilliod et al. v, Monsanto Company ordered the agrochemical giant to pay $2.055 billion in damages to the plaintiffs, Alva and Alberta Pilliod, a Bay Area couple in their 70s.

  • $289.2 Million Verdict Personal Injury

    On Aug. 10, 2018, a San Francisco jury ordered Monsanto to pay $39.25 million in compensatory damages and $250 million in punitive damages to Mr. Johnson, a former groundskeeper who alleged exposure to Monsanto’s herbicides caused him to develop terminal non-Hodgkin lymphoma.

  • $265 Million Settlement Fatal Train Crash

    In 2016, Wisner Baum attorney Timothy A. Loranger and six other attorneys in the Plaintiffs’ Management Committee were able to secure a $265 million settlement for victims of the 2015 Amtrak 188 derailment in Philadelphia, one of the largest in the U.S. for 2016.

  • $105 Million Settlement Pharmaceutical Settlement

    Wisner Baum obtained $105 million on behalf of multiple clients involved in a pharmaceutical negligence case.

  • $80 Million Verdict Personal Injury

    Wisner Baum attorneys served on the trial team in the case of Hardeman v. Monsanto Company, which resulted in an $80 million jury verdict for the plaintiff, Edwin Hardeman.

  • $63 Million Settlement Paxil Pediatric Class Action

    $63 million pediatric class action re false promotion of Paxil. Judge approves final terms of improved national pediatric paxil class action settlement – consumers get a better deal.

Nationally-Recognized Civil Trial Lawyers

Advocating for Justice Nationwide

For nearly 40 years, Wisner Baum has sought justice for our clients by holding major companies and manufacturers accountable for the harm their products and services have caused. Nationally recognized as a preeminent plaintiff’s law firm, our award-winning attorneys have developed a reputation for breaking new legal ground, holding Fortune 500 companies accountable, influencing public policy, raising public awareness, and improving product safety.

A Powerful Record of Results

Since 1985, our professional legal team has won over $4 billion in historic verdicts and settlements for our clients.

Based in Los Angeles, we’ve taken on thousands of domestic and international cases in complex areas like trucking accidents, pharmaceutical drug and medical device injuries, consumer class actions, aviation accidents, product liability, train accidents, bus crashes, and toxic torts.

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Get In Touch Contact us or call us at (855) 948-5098 for a free consultation.

Our Areas of focus


When you have been injured, every second matters. Wisner Baum is here to do what it takes to secure the justice you deserve.

Locally & Nationally Recognized

Recognized as One of America’s Leading Litigation Firms

With a record of winning some of the most significant jury verdicts in recent history – such as the first and third Roundup cases against agrochemical giant Monsanto, which resulted in a combined $2.344 billion verdicts – our attorneys at Wisner Baum are often featured by the media, both here in the United States as well as abroad. Appearing thousands of times in television shows, radio programs, documentaries, newspapers, books, and magazines, our preeminent lawyers are committed to sharing our knowledge and insight with the international legal community – and with the American public we serve.

Because of this approach, we have also received many awards and accolades for our legal advocacy. Wisner Baum has often been recognized by prestigious organizations like Martindale-Hubbell®, Best Lawyers in America®, the Multi-Million Dollar Advocates Forum, Super Lawyers, the National Board of Trial Advocacy, and Trial Lawyer Magazine, among many others. We were also honored to be a Finalist in the 2020 Elite Trial Lawyers Mass Torts "Law Firm of the Year" by The National Law Journal, and to receive the National Trial Lawyers: Top 100 “Trial Team of the Year Award" in 2019.

If you or your loved ones have been injured as a result of another person’s negligence, we can provide the client-focused and trial-ready counsel that you deserve.

a strong voice in worldwide media. Wisner Baum has been recognized by national and international media as one of America’s leading firm

Client-Focused Representation


We believe our track record speaks for itself. But you don’t have to take our word for it. See what our clients have to say about working with us.

    "I Can’t Imagine a Better Law Firm"

    Multiple lawyers recommended Wisner Baum to me and I have been consistently impressed with the quality of their work.

    - Best Law Firms Survey
    "They Are About Changing the Systems..."

    Wisner Baum are not only amazing attorneys but more importantly, they are activists. They are about changing the systems which got us into trouble in the first place. They understand their role in the process of making change.

    - Kim Witczak
    "Top Legal Minds in the Country"

    The Wisner Baum firm has some of the top legal minds in the country; they are driven, determined, trustworthy, ethical and passionate.

    - From Best Lawyers® Best Law Firms


  • R. Brent  Wisner Photo
    R. Brent Wisner Attorney, Managing Partner

    R. Brent Wisner is the managing partner of Wisner Baum and is based at our San Francisco Bay Area office. Brent is driven by a deep-rooted passion for using the law to help those who have been marginalized and hurt by large, and sometimes malicious, corporations.

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  • Michael L. Baum Photo
    Michael Baum Attorney, Senior Partner

    Michael L. Baum is a senior partner of Wisner Baum (formerly Baum Hedlund Aristei & Goldman) with nearly 40 years of experience. He was the managing partner of Baum Hedlund from 1993 to 2022 and proudly turned over the reins to R. Brent Wisner in January of 2023.

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  • Bijan  Esfandiari Photo
    Bijan Esfandiari Attorney, Senior Partner

    Bijan Esfandiari is a pharmaceutical product liability litigation attorney and senior partner at Wisner Baum in Los Angeles. Since joining the firm in 2007, Bijan has worked as lead counsel on several cutting-edge pharmaceutical and medical device cases.

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  • Timothy A. Loranger Photo
    Timothy Loranger Attorney, Senior Partner, Pilot, Marine Corps Veteran

    Timothy A. Loranger is an attorney and senior partner at the national mass disaster law firm of Wisner Baum. A consumer attorney, pilot, and avid citizen advocate.

    Read Bio

Why Choose Wisner Baum?

  • Proven Track Record

    Wisner Baum has recovered over $4 billion for our clients. We know what it takes to win big cases against big companies.

  • Award-Winning Law Firm

    Recognized as one of U.S. News – Best Lawyers® “Best Law Firms,” we have won the National Trial Lawyers’ Mass Tort Trial Team of the Year award multiple times.

  • No Fees Unless We Win

    Our trucking accident lawyers offer free case consultations and operate on contingency, meaning there are no fees unless we win.


    We are a California law firm with offices in Los Angeles, San Diego, Sacramento, Ontario, Bakersfield, and the San Francisco Bay Area.


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