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.



U/Z Adds Brent Colasurdo as Litigation Associate

February 5, 2014 – Irvine, California – Umberg Zipser LLP is pleased to announce that

February 6, 2015 󰀄
Former California High Speed Rail Chair Umberg Joins Groundbreaking Ceremony

U/Z’s Tom Umberg, former Chair of the California High Speed Rail Authority, was on the

January 7, 2015 󰀄
Umberg Zipser Ranked in First Tier for Commercial Litigation and IP Litigation by “Best Law Firms”

“BestUmberg Zipser LLP has received a “Tier One” in the 2015 “Best Law Firms” list by U.S. News & World Report and Best Lawyers (R) in the Orange County metropolitan area in both the Commercial Litigation and Intellectual Property Litigation practice areas. The firm also was recognized for its excellence in Real Estate Litigation and Banking & Finance Litigation. Formed in January, Umberg Zipser has received this prestigious recognition in its first year of existence.

November 4, 2014 󰀄
Tom Umberg Featured on OC Bar President’s Page: “Thanking Our Veteran Colleagues”

Thomas J. Umberg” width=The President’s Page of the November 2014 issue of Orange County Lawyer magazine is devoted to thanking attorneys in the Orange County community who have served in the U.S. armed forces. The column highlights the careers of several Orange County lawyers, including U/Z founding partner Tom Umberg.

November 1, 2014 󰀄
U/Z Lawyers Front and Center at Annual ABTL Meeting

Umberg Zipser attorneys were prominent at the recently concluded 41st Annual Seminar of the Association of Business Trial Lawyers (“ABTL”). The program’s theme was “The Science of Decision Making,” and hundreds of attorneys and judges from the five ABTL chapters across the state attended. Tom Umberg spoke on a panel discussing “How Juries Decide and How We Help Them Decide,” offering insights gleaned from his 100+ trials. Adina Stowell, who serves on the Board of the Orange County ABTL Chapter, was on the planning committee for the seminar.

October 30, 2014 󰀄

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