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®.  This 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.


Umberg Zipser 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 󰀄
State-wide Groundwater Management in California

What happens when California runs out of water? This question has been on the minds

October 27, 2014 󰀄
Kim Bick in The Recorder on “Fighting the Law Firm ‘Motherhood Penalty”

Umberg Zipser partner Kim Bick published an opinion piece in The Recorder on Septermber 26,

September 30, 2014 󰀄
Dean Zipser Named to OC Metro’s Top Lawyer List for 2014

U/Z’s Dean Zipser has been named to OC Metro‘s 2014 list of Top Lawyers which

September 1, 2014 󰀄
U/Z Partners Reagan, Umberg and Zipser Honored by “Best Lawyers” for 2015

Umberg Zipser partners Carole Reagan, Tom Umberg and Dean Zipser have been selected by their

August 20, 2014 󰀄

Food for Thought

If you always do what you always did, you will always get what you always got.

–Albert Einstein