Skip to content
umberg-zipser-llp
  • (949) 679-0052
  • [email protected]
  • ABOUT
    • Firm Overview
    • Selected Honors & Awards
    • Professional Activities & Community Involvement
    • Charitable Support
    • Careers
  • PRACTICE AREAS
    • Commercial Litigation
    • Intellectual Property
    • Lawyer Liability & Legal Ethics
    • Class Actions
    • Government & Regulatory
    • White Collar Investigations & Defense
  • PROFESSIONALS
    • Brent S. Colasurdo
    • Ryan S. Dean
    • Ethan Feng
    • Martin Fessenmaier, Ph.D.
    • Mark A. Finkelstein
    • Scott B. Garner
    • Amy Lesperance Han
    • Phillip R. Kaplan
    • Molly Magnuson
    • Priti Phukan, Ph.D.
    • Carole E. Reagan
    • Todd W. Smith
    • Adina W. Stowell
    • Mei Tsang
    • Thomas J. Umberg
    • Vikki L. Vander Woude
    • Dean J. Zipser
  • NEWS
  • CONTACT
Menu
  • ABOUT
    • Firm Overview
    • Selected Honors & Awards
    • Professional Activities & Community Involvement
    • Charitable Support
    • Careers
  • PRACTICE AREAS
    • Commercial Litigation
    • Intellectual Property
    • Lawyer Liability & Legal Ethics
    • Class Actions
    • Government & Regulatory
    • White Collar Investigations & Defense
  • PROFESSIONALS
    • Brent S. Colasurdo
    • Ryan S. Dean
    • Ethan Feng
    • Martin Fessenmaier, Ph.D.
    • Mark A. Finkelstein
    • Scott B. Garner
    • Amy Lesperance Han
    • Phillip R. Kaplan
    • Molly Magnuson
    • Priti Phukan, Ph.D.
    • Carole E. Reagan
    • Todd W. Smith
    • Adina W. Stowell
    • Mei Tsang
    • Thomas J. Umberg
    • Vikki L. Vander Woude
    • Dean J. Zipser
  • NEWS
  • CONTACT
Exceptional Quality With The Personal Service Of A Boutique
Umberg/Zipser's team of accomplished professionals are consistently recognized as among the very best in their
practice areas.
LEARN MORE

Experience

Integrity

Results

2
Best Lawyers 2022
Civic 50 OC
ocba
5
Best Lawyers 2021
SL Badge 2021
best-law-firms-badge-small-2020
super-lawyers-2020
best-law-firms-badge-small-2020
best-law-firms-badge-small-2019
americas-top-100
super-lawyers-2019
best-law-firms-badge-small-2019
best-law-firms-badge-small-2018
super-lawyers-2018
best-law-firms-badge-small-2018
best-law-firms-badge-small-2017
super-lawyers-2017
best-law-firms-badge-small-2017
best-law-firms-badge-small-2016
super-lawyers-2016
best-law-firms-badge-small-2016
best-law-firms-badge-small-2015
super-lawyers-2015
best-law-firms-badge-small-2015
Previous
Next
Best Law Firms 2023 Homepage
BPTW LOGO
2
Best Lawyers 2022
Civic 50 OC
ocba
5
Best Lawyers 2021
SL Badge 2021
best-law-firms-badge-small-2020
super-lawyers-2020
best-law-firms-badge-small-2020
best-law-firms-badge-small-2019
americas-top-100
super-lawyers-2019
best-law-firms-badge-small-2019
best-law-firms-badge-small-2018
super-lawyers-2018
best-law-firms-badge-small-2018
best-law-firms-badge-small-2017
super-lawyers-2017
best-law-firms-badge-small-2017
best-law-firms-badge-small-2016
super-lawyers-2016
best-law-firms-badge-small-2016
best-law-firms-badge-small-2015
super-lawyers-2015
best-law-firms-badge-small-2015
Previous
Next

Firm Overview

About Us

Umberg/Zipser LLP is a premier business litigation and intellectual property boutique law firm. 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, our lawyers provide exceptional work with the unparalleled personal service of a boutique.  

Our Culture

Umberg/Zipser believes in giving back, both to our community and to our profession. We regularly handle pro bono matters, and our attorneys devote countless hours to supporting — and leading — professional and community organizations. It would be difficult to find another firm in Orange County, regardless of size, that can boast the number of community leaders that exist at Umberg/Zipser.

Why Us?

By combining big-firm experience with small-firm efficiencies, we can handle complex matters for large companies, but we also are nimble enough to represent small companies and entrepreneurs. Our clients come to us because we deliver the highest quality work product together with extraordinary service.

LEARN MORE ABOUT US

Practice Areas

We Have the Experience to Handle a Wide Array of Matters

Commercial Litigation
We handle a wide variety of commercial litigation matters, including breach of contract, fraud, unfair competition, and other business torts.
LEARN MORE
Intellectual Property
We provide national and international patent and trademark prosecution services, and we litigate matters involving patents, trademarks, copyrights, false advertising, and trade secrets.
LEARN MORE
Lawyer Liability & Legal Ethics
Our attorneys have extensive experience defending law firms and lawyers against claims by former clients and third parties.
LEARN MORE
Class Actions
We have handled scores of class action cases in state and federal courts involving a wide variety of claims and subject areas.
LEARN MORE
Government & Regulatory
We develop effective, practical strategies to address the governmental issues that impact our clients.
LEARN MORE
White Collar Investigations & Defense
Our attorneys have deep experience in defending and investigating allegations of white collar criminal conduct.
LEARN MORE
Commercial Litigation
We handle a wide variety of commercial litigation matters, including breach of contract, fraud, unfair competition, and other business torts.
LEARN MORE
Intellectual Property
We provide national and international patent and trademark prosecution services, and we litigate matters involving patents, trademarks, copyrights, false advertising, and trade secrets.
LEARN MORE
Lawyer Liability & Legal Ethics
Our attorneys have extensive experience defending law firms and lawyers against claims by former clients and third parties.
LEARN MORE
Class Actions
We have handled scores of class action cases in state and federal courts involving a wide variety of claims and subject areas.
LEARN MORE
Government & Regulatory
We develop effective, practical strategies to address the governmental issues that impact our clients.
LEARN MORE
White Collar Investigations & Defense
Our attorneys have deep experience in defending and investigating allegations of white collar criminal conduct.
LEARN MORE
VIEW ALL PRACTICE AREAS

Professionals

We Have Exceptional Attorneys Who Stand Ready to Serve Our Clients

Brent S. Colasurdo

  • (949) 679-0052
  • [email protected]
Brent S. Colasurdo is an associate with Umberg/Zipser where he focuses his practice on complex commercial litigation.
READ MORE

Ryan S. Dean

  • (949) 679-0052
  • [email protected]
Ryan specializes in global patent and trademark prosecution for clients of all sizes, and focuses primarily in the areas of mechanical and aerospace engineering
READ MORE

Ethan Feng

  •  (949) 679-0052
  •  [email protected]

Ethan Feng is an associate at Umberg/Zipser where he focuses his practice in complex commercial litigation, professional liability disputes, and employment litigation.

READ MORE

Martin Fessenmaier, Ph.D.

  • (949) 679-0052
  • [email protected]
Martin has almost two decades of experience in domestic and International patent prosecution, working in the fields of biochemistry and molecular biology, bioinformatics, medical devices, organic chemistry, and general mechanical arts.
READ MORE

Mark A. Finkelstein

  • (949) 679-0052
  • [email protected]

Mark Finkelstein is a partner at Umberg/Zipser with more than 25 years of intellectual property and complex litigation experience.


READ MORE

Scott B. Garner

  • (949) 679-0052

  • [email protected]

Scott B. Garner is a partner at Umberg/Zipser in Irvine, California. He represents clients in complex business litigation matters, with a particular focus on professional liability disputes and ethics counseling.


READ MORE

Phillip R. Kaplan

Partner

  • (949) 679-0052
  • [email protected]

Phillip R. Kaplan is a recognized leader in the Orange County legal community, and is an accomplished business trial lawyer with a record of handling his client’s most difficult cases. 


READ MORE

Molly Magnuson

  • (949) 679-0052
  • [email protected]

Molly Magnuson is an experienced, results-oriented litigation attorney. Molly’s experience comes not only from working for significant clients, but also from working in some of America’s top law firms, which has created exposure to high-stakes, complex commercial litigation.

READ MORE

Priti Phukan, Ph.D.

  • (949) 679-0052
  • [email protected]
Priti Phukan concentrates her practice on patent and trademark prosecution across various technology industries, including chemistry, life sciences, diagnostics, medical devices, and mechanical engineering.
READ MORE

Carole E. Reagan

  • (949) 679-0052
  • [email protected]
Carole E. Reagan’s practice focuses on intellectual property and complex commercial litigation. She has successfully represented business clients across a diverse array of industries.
READ MORE

Todd W. Smith

  • (949) 679-0052
  • [email protected]
Todd Smith’s practice focuses on complex business litigation in state and federal courts representing companies and individuals in partnership disputes, shareholder and derivative litigation, real estate disputes, trade secrets, and unfair competition claims.
READ MORE

Adina W. Stowell

  • (949) 679-0052
  • [email protected]

Adina Stowell specializes in complex litigation involving corporate, commercial, trade secret, and real estate disputes in both state and federal courts.

READ MORE

Mei Tsang

  • (949) 679-0052
  • [email protected]
Mei has an international intellectual property practice focused on helping clients formulate their IP strategy, and shepherding their IP through various business cycles to achieve their business goals worldwide.
READ MORE

Thomas J. Umberg

  • (949) 679-0052
  • [email protected]
Thomas J. Umberg has extensive trial experience in both federal and state courts and has been selected as a “Best Lawyer” for the prestigious publication “The Best Lawyers in America®” in commercial litigation for 12 consecutive years.
READ MORE

Vikki L. Vander Woude

  • (949) 679-0052
  • [email protected]
Vikki has a broad and diverse professional background having worked in large and small law firms, as in-house counsel, and as a research attorney for the courts, which gives her a unique perspective and skill set that is of immeasurable benefit to clients.
READ MORE
Dean Zipser

Dean J. Zipser


  • (949) 679-0052
  • [email protected]

Dean J. Zipser is a recognized leader in the Orange County legal community, having served as President of the Orange County Bar Association (OCBA) along with many other professional leadership positions.


READ MORE

NEWS and EVENTS

Umberg/Zipser in the Community

Priti Phukan, Ph.D. Promoted to Partner

February 10, 2023

Umberg/Zipser LLP (U/Z), a premier business litigation and intellectual property law firm located in Irvine, California, is pleased to announce that Priti Phukan has been promoted to partner. Priti is a member of the U/Z’s Intellectual Property (IP) Practice Group and her areas of legal expertise include intellectual property law, patent prosecution and counseling, patent portfolio development, and domestic and foreign IP practices. Priti

Read More »

Umberg/Zipser LLP Celebrates The Ninth Anniversary As A Firm

January 25, 2023

We are delighted to share that Umberg/Zipser LLP just celebrated our nine-year anniversary as a firm! When we founded the law firm in 2014, we began with a vision of continuing to provide outstanding client service, in a supportive and team-oriented work environment, while actively giving back to our profession and to the community. We have grown from a team of four to 17

Read More »

Orange County Bar Association (OCBA) Annual Judges’ Night 2023

January 20, 2023

On Thursday evening, January 19th, the Orange County Bar Association (OCBA) held its annual Judges’ Night. The Honorable Martin J. Jenkins, Associate Justice of the California Supreme Court, installed Michael A. Gregg, as 2023 OCBA President, along with the other new officers and directors. Umberg/Zipser’s own Mei Tsang was installed as OCBA Treasurer and as a Board Member for the OCBA Charitable Fund Board.

Read More »

Super Lawyers 2023 Selects Seven Umberg/Zipser Attorneys

January 12, 2023

Umberg/Zipser LLP is proud to announce that seven of its partners have been included in the Southern California Super Lawyers List for 2023, a recognition reserved for only five percent of lawyers in California. In addition, both Dean Zipser and Scott Garner have been recognized this year as a Top 50 Orange County Lawyer—Dean for the fifth consecutive year and Scott for the second year. The following Umberg/Zipser attorneys have been recognized in the Southern

Read More »

Dean Zipser Authors Timely Article for OCBA’s Orange County Lawyer Magazine entitled “Mentoring and Training New Firm Lawyers in the 2020s.”

November 3, 2022

Umberg/Zipser LLP partner, Dean J. Zipser recently authored a timely article for the Orange County Lawyer, published by the Orange County Bar Association (OCBA), entitled “Mentoring and Training New Firm Lawyers in the 2020s. In this article, Dean discusses how the pandemic has created a need for successful law firms to navigate a new work paradigm, and why attention to mentoring is essential in

Read More »

Umberg/Zipser LLP Ranked Tier One on “Best Law Firms” List by U. S. News & World Report 2023

November 3, 2022

Umberg/Zipser LLP (U/Z), a premier business litigation and intellectual property law firm located in Irvine, California, has again been ranked Tier One on the “Best Law Firms” list by U.S. News & World Report for the Orange County Metropolitan area. The firm has received this outstanding recognition every year since its inception in 2014. The ranking highlights top law firms, recognized by their clients

Read More »
View All News

CAREERS

Come Join Our Amazing Team

If you are an exceptional attorney who thrives on delivering top-notch client service, and would enjoy practicing law in a small, collegial environment, we invite you to contact us to learn more about how we can support your career growth. Umberg/Zipser is proud of its diversity, and is an equal opportunity employer.

CONTACT US

CAREERS

At Umberg/Zipser LLP, it’s the quality of our people that makes our firm and work environment rewarding and unique. We are proud to have been recognized by our team as one of Orange County’s “2022 Best Places to Work.”      

If you are an exceptional attorney, who thrives on delivering top-notch client service, and enjoys practicing law in a strong team culture, we invite you to contact us to learn more about how we can support your career growth.

Umberg/Zipser is also proud to have created a work environment that promotes and honors diversity and we are an equal opportunity employer. We look forward to hearing from you soon.

CONTACT US

Umberg Zipser

1920 Main Street, Suite 750 Irvine CA 92614

Contact Us

If you are interested in retaining our services, or you want to learn more about Umberg/Zipser, we look forward to hearing from you.  Please note that merely sending us an email does not create an attorney-client relationship, and anything you send to us will not be confidential or privileged unless we have agreed to represent you. 

  • (949) 679-0052
  • 1920 Main Street, Suite 750, Irvine, CA 92614
  • [email protected]
  • www.umbergzipser.com

Umberg/Zipser is a premier business litigation and intellectual property 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. 

Linkedin Rss Envelope

Navigation

  • ABOUT
    • Firm Overview
    • Selected Honors & Awards
    • Professional Activities & Community Involvement
    • Charitable Support
    • Careers
  • PRACTICE AREAS
    • Commercial Litigation
    • Intellectual Property
    • Lawyer Liability & Legal Ethics
    • Class Actions
    • Government & Regulatory
    • White Collar Investigations & Defense
  • PROFESSIONALS
    • Brent S. Colasurdo
    • Ryan S. Dean
    • Ethan Feng
    • Martin Fessenmaier, Ph.D.
    • Mark A. Finkelstein
    • Scott B. Garner
    • Amy Lesperance Han
    • Phillip R. Kaplan
    • Molly Magnuson
    • Priti Phukan, Ph.D.
    • Carole E. Reagan
    • Todd W. Smith
    • Adina W. Stowell
    • Mei Tsang
    • Thomas J. Umberg
    • Vikki L. Vander Woude
    • Dean J. Zipser
  • NEWS
  • CONTACT
  • ABOUT
    • Firm Overview
    • Selected Honors & Awards
    • Professional Activities & Community Involvement
    • Charitable Support
    • Careers
  • PRACTICE AREAS
    • Commercial Litigation
    • Intellectual Property
    • Lawyer Liability & Legal Ethics
    • Class Actions
    • Government & Regulatory
    • White Collar Investigations & Defense
  • PROFESSIONALS
    • Brent S. Colasurdo
    • Ryan S. Dean
    • Ethan Feng
    • Martin Fessenmaier, Ph.D.
    • Mark A. Finkelstein
    • Scott B. Garner
    • Amy Lesperance Han
    • Phillip R. Kaplan
    • Molly Magnuson
    • Priti Phukan, Ph.D.
    • Carole E. Reagan
    • Todd W. Smith
    • Adina W. Stowell
    • Mei Tsang
    • Thomas J. Umberg
    • Vikki L. Vander Woude
    • Dean J. Zipser
  • NEWS
  • CONTACT

Subscribe

Contact Us

Copyright © 2021 - Umberg/Zipser | All rights reserved. Copyright & Legal Disclaimer