Experience, Integrity, Results

About Us

Exceptional client service . . . delivered efficiently

Umberg Zipser LLP is a premier business litigation boutique.  Drawing on decades of experience in some of the nation’s largest and most prestigious law firms, as well as national and state government service, Umberg Zipser provides clients with unparalleled legal services.

The firm’s lawyers are recognized as among the very best in their practice areas.  They are consistently named as Best Lawyers in America® and Super Lawyers®.  Last year, for example, founding partner Dean Zipser was named by Best Lawyers as the Lawyer of the Year for Bet-the-Company litigation in Orange County.

We pursue our clients’ objectives strategically and with maximum efficiency and flexibility across a wide array of practice areas, including intellectual property, class actions, unfair competition, environmental, real estate, and other complex business litigation, as well as white collar criminal defense.



DJ Profiles the “Long History” of U/Z Partners as a Litigation Team

The Daily Journal published an article on September 25, 2015 entitled “Long History” that highlights the litigation experience and expertise of the team at Umberg Zipser and the entrepreneurial nature of the firm.

September 30, 2015 󰀄
Three U/Z Partners Once Again Selected for Inclusion in “Best Lawyers in America”

Orange County’s Umberg Zipser LLP is pleased to announce that partners Carole Reagan, Tom Umberg and Dean Zipser have been selected by their peers for inclusion in The Best Lawyers in America© 2016.

August 17, 2015 󰀄
Passing the Torch at Constitutional Rights Foundation, Orange County

U/Z’s Adina Stowell recently ended her term as President of the Board of Directors Constitutional Rights Foundation, Orange County (CRF-OC). Adina will continue to serve on CRF-OC’s Executive Committee and head the organization’s Board Development Committee. At the same time, Umberg Zipser will increase its strong commitment, as Dean Zipser is stepping into the role of Secretary and will be in line to be President of CRF-OC beginning in June 2017.

U/Z’s Zipser Contributes to Advice for New Lawyers from the OC Bar’s “Masters Division”

The June issue of OC Lawyer included a segment, “Professional Practice Makes Perfect (Advice from the Masters),” by Julie McCoy that features advice from the “Masters Division” of the Orange County Bar to new lawyers, including words of wisdom from former Master Division Chair Dean Zipser.

Dean Zipser Co-Authors Article for OC Lawyer on Starting a New Law Firm

UZ’s Dean Zipser collaborated with Lei Lei Wang Ekvall on an article that appears in the June 2015 issue of Orange County Lawyer entitled, “Starting a New Orange County-Based Law Firm: Then and Now.”

June 19, 2015 󰀄

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