About Wisner Baum

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.

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.

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.

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.

Monique Alarcon is an attorney in the Los Angeles office of Wisner Baum where she focuses her practice on the firm’s medical device cases, pharmaceutical drug liability and consumer fraud litigation.

William Crawford Appleby IV is an attorney in the Los Angeles office of Wisner Baum. He focuses on complex law and motion matters, in-depth legal research and writing, and case strategy.

Pedram Esfandiary is a partner and trial attorney based in the Los Angeles office of Wisner Baum, where he concentrates his practice on toxic tort injuries, pharmaceutical drug liability, class actions, consumer fraud litigation and police misconduct lawsuits.

Adam M. Foster is an attorney in the Los Angeles office of Wisner Baum. Adam concentrates his practice on class actions and mass torts particularly those related to pharmaceuticals, consumer products, and products liability, generally.

Matthew P. French is an attorney at Wisner Baum’s Los Angeles office, where he focuses his practice on the firm’s commercial transportation accident cases. Led by a strong desire to help people when they need it most, Matthew’s clients appreciate his empathetic approach to how he handles his cases.

Ari Friedman is a partner and trial attorney at Wisner Baum where he focuses his practice on complex and multi-district litigation, product liability, and personal injury and wrongful death cases stemming from transportation accidents (including aviation accidents and truck crashes) and other catastrophic injury (including TBI).

Harrison E. James is an attorney in the Los Angeles office of Wisner Baum, where he focuses his practice on the firm’s pharmaceutical drug liability, class action, and consumer fraud litigation.

Mayra Maturana is an attorney in the Los Angeles office of Wisner Baum where she concentrates her practice on toxic tort injuries. She is part of firm’s legal team handling the toxic baby food litigation.

Clay Robbins III is an attorney and partner in the Los Angeles office of Wisner Baum. A third-generation California lawyer, Clay concentrates his practice on commercial transportation accident litigation and mass disasters.

Stephanie B. Sherman is a multiple award-winning trial lawyer and partner at Wisner Baum. With over 20 years of experience, she has helped thousands of clients in serious personal injury, wrongful death, product liability, chemical exposure, and dangerous pharmaceutical cases.

Helen E. Tokar is an attorney in the Los Angeles office of Wisner Baum where she focuses her practice on the firm’s Zantac cancer litigation.

Cara J. Luther is of counsel to Wisner Baum, focusing on the firm’s mass disaster cases and commercial transportation accident cases. She worked for 31 years as a full-time attorney at the firm until 2022.

Frances M. Phares is of counsel to Wisner Baum, where she focuses her practice on personal injury and wrongful death litigation stemming from major transportation disasters, pharmaceutical product liability cases and toxic exposure across the nation.

Mark H. Schlein transitioned to ”of counsel” status to Wisner Baum in 2022 and continues to focus on the firm’s whistleblower qui tam cases. For 11 years he worked full time as the firm’s top whistleblower attorney, handling dozens of whistleblower cases.

Ronald L. M. Goldman retired after 60 years in the practice of law on January 10, 2023. He held the positions of vice president and senior trial attorney at Baum Hedlund & Aristei & Goldman (now Wisner Baum) and was a pillar of Baum Hedlund for 19 years.

Paul J. Hedlund was an attorney for 45 years and a member of our team at Baum Hedlund Aristei & Goldman for 30 of those years. He served as one of the firm’s senior shareholders for more than 20 years, overseeing the firm’s major transportation accident cases.

J. Clark Aristei was an attorney for nearly 40 years and a member of our team at Wisner Baum for 26 of those years. Clark served as a senior shareholder for more than two decades and then semi-retired while also acting as Of Counsel to our firm.