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    • Marcus S. Quintanilla
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Umberg/Zipser LLP Elects Mark Finkelstein as Managing Partner

  • January 5, 2026
IRVINE, Calif., January 5, 2026 — Umberg/Zipser LLP announced today that partner Mark Finkelstein has been elected Managing Partner, becoming only the second managing partner in the firm’s history. Founding partner Dean Zipser, who has served as the firm’s sole managing partner since its inception, will continue his active legal practice while supporting the firm’s leadership transition.

This election reflects Umberg/Zipser’s thoughtful approach to long-term succession and its continued commitment to strategic growth, client service, and firm culture.

“Mark has been an integral part of Umberg/Zipser’s success and evolution,” said Dean Zipser. “He is deeply respected by our partners and clients alike, and he brings a steady, collaborative leadership style that reflects our firm’s values. I am proud of what we’ve built together and confident that Mark is the right person to lead the firm into its next chapter.”

Mark has been a key leader within the firm, and is known for his stellar legal and business judgment, client-first mindset, and ability to navigate complex challenges. As Managing Partner, he will focus on guiding the firm’s long-term strategy while maintaining the culture of excellence and collegiality that has defined Umberg/Zipser since its founding.

“It’s an honor to step into this role and to follow Dean, whose leadership and vision shaped the firm from day one,” said Mark. “Umberg/Zipser has always been about unwavering legal advocacy, a commitment to our community, and working as a team to deliver unmatched service to our clients. I look forward to building on the foundation that Dean tirelessly built for over a decade.”

About Umberg/Zipser LLP

Umberg/Zipser LLP is a leading law firm based in Irvine, California. With a team of highly skilled attorneys, the firm is known for its sophisticated business litigation and intellectual property practices. Umberg/Zipser is recognized for delivering strategic, results-driven solutions tailored to each client’s business objectives.

Media Contact:
Kristina Hawfield
Communications Consultant to Umberg/Zipser LLP
949-278-0973
[email protected]

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Umberg Zipser

1920 Main Street, Suite 750 Irvine CA 92614

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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.uzllp.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. 

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  • 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
    • Ryan S. Dean
    • Ethan Feng
    • Martin Fessenmaier, Ph.D.
    • Mark A. Finkelstein
    • Scott Garner
    • Amy Lesperance Han
    • Phillip Kaplan
    • Nasser Khateeb
    • Ellen Kim
    • Molly Magnuson
    • Priti Phukan, Ph.D.
    • Marcus S. Quintanilla
    • Carole Reagan
    • Todd Smith
    • Jeremy G. Suiter
    • Ryan T. Tran
    • Mei Tsang
    • Thomas Umberg
    • Chris Wang
    • Dean 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
    • Ryan S. Dean
    • Ethan Feng
    • Martin Fessenmaier, Ph.D.
    • Mark A. Finkelstein
    • Scott Garner
    • Amy Lesperance Han
    • Phillip Kaplan
    • Nasser Khateeb
    • Ellen Kim
    • Molly Magnuson
    • Priti Phukan, Ph.D.
    • Marcus S. Quintanilla
    • Carole Reagan
    • Todd Smith
    • Jeremy G. Suiter
    • Ryan T. Tran
    • Mei Tsang
    • Thomas Umberg
    • Chris Wang
    • Dean Zipser
  • NEWS
  • CONTACT

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