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.



Tom Umberg Chosen as a Lawyer Representative for the Ninth Circuit

Earlier this year, U/Z’s Tom Umberg was selected as a Lawyer Representative to the Ninth Circuit Court of Appeals, representing the Central District of California. “It’s a great honor to be selected to serve in this role and I’m looking forward to participating in the program and making a contribution to the court,” says Tom.

U/Z Continues Strong Commitment to Public Law Center

The lawyers at Umberg Zipser are long-time supporters of Orange County’s Public Law Center (PLC)

U/Z Adds Brent Colasurdo as Litigation Associate

Brent ColasurdoBrent S. Colasurdo has joined the firm as a litigation associate. Brent previously served as a law clerk to the Honorable Cormac J. Carney and the Honorable Alicemarie H. Stotler in the U.S. District Court for the Central District of California from 2013 to 2015. Before his two-year clerkship, he was a litigation associate with Rinos & Martin, LLP in Tustin.

April 20, 2015 󰀄
Dean Zipser Selected Co-Vice-Chair of State Bar Attorney Rules Revision Commission

Dean ZipserDean Zipser has been named co-vice-chair of the recently formed California State Bar Commission for the Revision of the Rules of Professional Conduct. Justice Lee Edmon, Presiding Justice of the Second District Court of Appeal, Division Three, will chair the 18-member commission to revise California’s ethical rules for attorneys. Jeffrey L. Bleich, a former California State Bar President who recently served as ambassador to Australia, is the other co-vice-chair.

April 14, 2015 󰀄
Former California High Speed Rail Chair Umberg Joins Groundbreaking Ceremony

High Speed RailU/Z’s Tom Umberg, former Chair of the California High Speed Rail Authority, was on the scene in Fresno with Governor Jerry Brown and a host of other dignitaries earlier this year to help break ground on the state’s high speed rail project that promises to transform the transportation scene in California as it rolls out over the next 15 years.

April 13, 2015 󰀄

Sign up for U/Z e-News


Email Address (required):