About Us
Driven by Justice In All Its Dimensions
At DiCello Levitt, we are dedicated to achieving justice for our clients through civil and human rights, class action, business-to-business, public client, whistleblower, personal injury, and mass tort litigation.
Our lawyers are highly respected for their ability to prosecute and win cases—whether by trial, settlement, or otherwise—for people who have suffered harm, global corporations that have sustained significant economic losses, and public clients seeking to protect their citizens’ rights and interests.
Every day, we put our reputations and capital on the line for our clients.

Our Attorneys

Brian O’Mara
PARTNER
Brian O’Mara is a partner in DiCello Levitt’s San Diego office. His practice focuses on complex securities, antitrust, and consumer protection litigation in state and federal courts across the United States.
Over the past 20 years, Brian has served as lead or co-lead counsel in numerous shareholder, consumer protection, and antitrust actions involving companies in the financial services, technology, pharmaceutical, entertainment and gaming, and telecommunications industries, which have yielded billions of dollars in recoveries. He has helped institutional investors protect their fund investments by securing leadership positions in dozens of securities and antitrust actions and has been responsible for a number of significant trial and appellate court rulings in the securities and antitrust space.
Prior to joining DiCello Levitt, Brian was a partner at a leading complex litigation law firm and served as chief underwriter officer for a global private equity and advisory firm specializing in litigation finance, judgment enforcement, asset recovery, and related strategies serving claimants, law firms and other professional service firms, and businesses across the globe. In this capacity, Brian was responsible for directing the firm’s underwriting process for prospective investments and managing the firm’s investment portfolio, which included litigation and arbitration disputes in jurisdictions around the world.
Brian has been twice recognized by the American Antitrust Institute’s Antitrust Enforcement Awards for the category of Outstanding Antitrust Litigation Achievement in Private Law Practice for his work in the ISDAfix price-fixing litigation and the EpiPen class action alleging antitrust and RICO violations. He has also been named a Super Lawyer by Super Lawyers Magazine for the past six consecutive years and recognized as a Leading Plaintiff Financial Lawyer by Lawdragon.
Brian graduated from the University of Kansas with a degree in economics, and he received his law degree from DePaul University College of Law, where he was the recipient of a CALI Excellence for the Future Award in securities regulation.

Adam Levitt
FOUNDING PARTNER
Adam Levitt is one of the nation’s leading advocates for plaintiffs in complex, multidistrict, class action, public client, mass tort, and commercial litigation. Drawing on his extensive experience pursuing and obtaining justice for those who have been wronged by powerful defendants, he co-founded DiCello Levitt to create a top-tier complex issues and trial firm founded on excellence, trust, and respect—where every team member’s voice and talents are valued.
In his decades-long career, Adam has scored numerous significant and precedent-setting victories, delivering more than $20 billion in recoveries to clients in biotechnology, financial services, securities, insurance coverage, consumer protection, automotive defects, agricultural products, and antitrust disputes. His reputation for innovatively taking on tough cases has led to his appointment to leadership positions in many historic and headline-grabbing litigations, including three of the largest biotechnology class actions in U.S. history, where he served as co-lead counsel, helped recover more than $1.7 billion on behalf of plaintiffs, and created a game-changing economic model to measure crop contamination damages that set the modern industry standard. He was also retained by multiple State Attorneys General to hold some of the world’s largest chemical companies accountable for widespread environmental contamination from their “forever chemicals” known as PFAS (per- and polyfluoroalkyl substances) and was retained by the City of Baltimore to address the catastrophic impact of the Francis Scott Key Bridge collapse, one of the largest maritime disasters in U.S. history. Additionally, as part of a leadership group characterized as a “class action dream team,” Adam helped secure a $16 billion settlement in litigation arising from Volkswagen’s emissions scandal, and, in a rare class action trial, he and his fellow co-lead counsel secured a milestone $102.6 million jury verdict against General Motors for hiding engine defects from consumers.
Adam is also a leader in the legal profession and a frequent speaker on multidistrict litigation, consumer protection, automotive litigation, biotechnology, corporate governance, securities litigation, and internet privacy. Nationally recognized as an authority on class action litigation, Adam writes a monthly class action column in The National Law Journal, has testified before the Illinois Supreme Court Rules Committee on class action practice, and chairs an annual class action litigation conference in Chicago.
As a founding partner of DiCello Levitt, Adam has cultivated a diverse roster of skilled litigators to advance the cause of justice for individuals, businesses, and public clients. The firm’s attorneys are highly respected for their ability to litigate and win cases and have secured billions of dollars in recoveries for their clients through class action, business-to-business, whistleblower, personal injury, civil rights, and mass tort litigation. They have worked on some of the highest-profile securities actions ever filed, developed game-changing legal theories to secure landmark wins against tech giants that misused and exposed massive troves of personal data, and held some of the world’s largest corporations accountable for endangering and harming American consumers. With a long history of working with public clients, Adam and his partners understand the wants and needs of government officials and their teams, and, as experts in trial practice and jury persuasion, they consistently achieve best-in-class results for their clients.
Adam’s own groundbreaking work on behalf of plaintiffs has been recognized locally and nationally in prestigious ranking directories, including Chambers USA, where he has received a Band 1 ranking for Mainly Plaintiffs Litigation in Illinois for three consecutive years. Chambers USA also ranked Adam in Illinois for General Commercial Litigation and nationwide for Product Liability Litigation, where the editors describe him as the “go-to plaintiffs’ attorney in the class actions space.” In 2021, 2022, and 2023, Benchmark Litigation named Adam a National Litigation Star and Securities and Litigation Star in Illinois. According to The National Law Journal, Adam is a “pioneer” in technology litigation. Crain’s Chicago Business has named him a Notable Litigator and Trial Attorney and a Notable Gen X Leader in Accounting, Consulting, and Law, and Lawdragon has named him one of the 500 Leading Plaintiff Financial Lawyers and one of the 500 Leading Plaintiff Consumer Lawyers in the United States.
An elected member of the American Law Institute and the Economic Club of Chicago, Adam considers the formation of DiCello Levitt in 2017 to be a pivotal moment in his distinguished legal career. With a shared vision and commitment to helping people and businesses use the legal system to have their voices heard, he and his partners intend to maintain their industry-wide influence for years to come with a steadfast resolve for justice in all its dimensions.

Henry Rosen
PARTNER
Henry Rosen is a results‐driven litigator with over three decades of experience recovering money on behalf of institutional and individual investors. A leading attorney in securities fraud class actions, he has obtained more than $1 billion for investors.
Henry has significant experience running all aspects of large, complex litigation. From ensuring his institutional and individual investor clients are prepared for depositions and court, to overseeing massive document reviews, to handling hundreds of depositions, to preparing pleadings and for oral argument before the court, Henry is a hands-on and meticulous attorney.
Some of Henry’s notable representations in large complex securities fraud class actions include:
- In re Cardinal Health, Inc. Sec. Litig.: This $600 million settlement is the largest recovery ever in a securities fraud class action in the Sixth Circuit U.S. Court of Appeals.
- Jones v. Pfizer Inc.: A $400 million settlement was reached on the eve of trial for investors in this misclassification of revenue case.
- In re FirstEnergy: Recovered $89.5 million for investors in a securities fraud class action after this Ohio utility company artificially inflated its stock price through false statements and omissions.
Henry is the lead litigator responsible for the ongoing 2016 Brazilian arbitration against Petrobras before the Bovespa panel in São Paulo, Brazil; a case brought by 24 institutional investors including the largest sovereign wealth funds globally and public pension funds across the United States.
He is a founding member of DiCello Levitt’s Securities and Financial Services Litigation practice in San Diego. Henry earned his Juris Doctor from the University of Denver Sturm College of Law and his bachelor’s degree from the University of California, San Diego after studying for a time at the American College in Paris, France.

Steve Jodlowski
PARTNER
Henry Rosen is a results‐driven litigator with over three decades of experience recovering money on behalf of institutional and individual investors. A leading attorney in securities fraud class actions, he has obtained more than $1 billion for investors.
Henry has significant experience running all aspects of large, complex litigation. From ensuring his institutional and individual investor clients are prepared for depositions and court, to overseeing massive document reviews, to handling hundreds of depositions, to preparing pleadings and for oral argument before the court, Henry is a hands-on and meticulous attorney.
Some of Henry’s notable representations in large complex securities fraud class actions include:
- In re Cardinal Health, Inc. Sec. Litig.: This $600 million settlement is the largest recovery ever in a securities fraud class action in the Sixth Circuit U.S. Court of Appeals.
- Jones v. Pfizer Inc.: A $400 million settlement was reached on the eve of trial for investors in this misclassification of revenue case.
- In re FirstEnergy: Recovered $89.5 million for investors in a securities fraud class action after this Ohio utility company artificially inflated its stock price through false statements and omissions.
Henry is the lead litigator responsible for the ongoing 2016 Brazilian arbitration against Petrobras before the Bovespa panel in São Paulo, Brazil; a case brought by 24 institutional investors including the largest sovereign wealth funds globally and public pension funds across the United States.
He is a founding member of DiCello Levitt’s Securities and Financial Services Litigation practice in San Diego. Henry earned his Juris Doctor from the University of Denver Sturm College of Law and his bachelor’s degree from the University of California, San Diego after studying for a time at the American College in Paris, France.