Skip to Content
No Fees Unless We Win 855-948-5098
About Us Client Focused. Trial Ready. Billions Won.

About Wisner Baum

Pursuing Justice on Behalf of Our Clients for Nearly 40 Years

Founded in Los Angeles, California in 1985, the law firm of Wisner Baum has earned a reputation for breaking new legal ground, holding major corporations accountable, influencing public policy, and raising public awareness about important safety issues. Our trial experience across a broad range of practice areas includes over $4 billion in verdicts and settlements.

These groundbreaking legal victories have earned major awards, including Law360’s Regional Powerhouse award, and the National Trial Lawyers’ Elite Trial Lawyers Mass Tort Trial Team of the Year award, induction into the U.S. News – Best Lawyers® “Best Law Firms” and the National Law Journal’s Verdicts Hall of Fame, and an AV® preeminent peer-review rating by Martindale-Nolo.

Wisner Baum attorneys have a long track record of successfully handling catastrophic injury cases. Our lawyers focus on commercial transportation litigation, pharmaceutical drug and medical device product liability, mass torts, and class actions. When we take on a case, your mission becomes our mission, and we pride ourselves on being your advocate in a time of great need. Our service to you and your family doesn’t stop with the pursuit of maximum compensation; we also work tirelessly to be a force for positive change. This includes advocating for improved safety, and fighting to deter future incidents from happening again.

No matter the opponent, no matter the odds, our firm continues to prove that we know how to win the biggest cases.  

To benefit from our experience, reputation, and resources, we invite you to contact our Los Angeles team today at (855) 948-5098 or submit our online contact form. We offer same-day appointments and free consultations. 


  • 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.

    Read Bio
  • 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.

    Read Bio
  • 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.

    Read Bio
  • 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

More Than $4 Billion Won

There’s a reason that many consider Wisner Baum to be, quite simply, among the best in the business: Our attorneys have represented thousands of victims in some of the most complex litigation, securing over $4 billion in recovery for victims of serious, life-altering injuries. Our firm served as co-lead trial counsel in cases against agrochemical giant Monsanto Company (now part of Bayer) that resulted in two of the largest jury verdicts in recent history, worth a combined $2.344 billion upon initial judgment. The verdicts in Johnson v. Monsanto Co. and Pilliod et al. v. Monsanto Co. were hard-earned legal victories that will have a lasting impact not just for the plaintiffs and their families, but for public health and the environment too.

  • $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.

  • $105 Million Settlement Pharmaceutical Settlement

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

  • $18 Million Settlement Whistleblower Settlement

    Wisner Baum secured an $18 million settlement against the Boeing Company for overcharging the U.S. government on aircraft maintenance.

  • $17.5 Million Settlement A Major US Plane Crash

    Wisner Baum obtained a $17.5 million settlement on behalf of a client who was killed in a major U.S. plane crash.

  • $15 Million Settlement Truck Accident

    Our firm successfully negotiated a $15 million catastrophic injury settlement for our clients. The case stemmed from a Southern California accident involving a commercial truck and a pedestrian.

California-Based Law Firm Taking on Cases Nationwide

While Wisner Baum’s main office is located in Los Angeles, our personal injury attorneys handle cases throughout California and across the United States. In fact, our firm has litigated personal injury and wrongful death cases on behalf of clients in all 50 states.

Our office locations:

West Coast

  • Los Angeles
  • San Francisco Bay Area
  • Bakersfield
  • Ontario
  • Sacramento
  • San Diego 

East Coast

  • Washington D.C.
Continue Reading Read Less
CALL (855) 948-5098

Contact our experienced attorneys to learn about your legal options. Your consultation is free and confidential.

  • Building Relationships
    We take pride in our professional relationships with referring attorneys and are equipped with the resources to take on your complex case.
  • Track Record of Success
    We have resolved thousands of cases worldwide, winning over $4 billion in verdicts and settlements on behalf of clients.
  • Free & Confidential Consultations
    Interested in exploring your legal rights? Schedule a free consultation with our team. You won't pay unless we win your case.

Ceaseless Advocacy

Our work is not solely about winning a verdict at trial or securing a settlement—it is about achieving all of your goals as outlined during our initial consultation. Wisner Baum attorneys have always fought, and will continue to fight to:

  • Improve consumer safety when corporations put profit over people.
  • Implement vital transportation safety technology that has the potential to save lives.
  • Use litigation as a catalyst for meaningful change that makes the world a better place.

Locally & Nationally Recognized

Let Our Team Help

Client Focused. Trial Ready. Billions Won.
  • Please enter your first name.
  • Please enter your last name.
  • Please enter your phone number.
    This isn't a valid phone number.
  • Please enter your email address.
    This isn't a valid email address.
  • Please enter your city.
  • Please enter your state.
  • Please make a selection.
  • Please make a selection.
  • Please enter a message.
  • 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.