D. Jason Lyon

D. Jason Lyon

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Jason Lyon provides skilled strategy and advocacy to clients in commercial and general civil litigation matters, both in the trial court and on appeal. His practice emphasizes high stakes business disputes, often centered on complex financial transactions and intricate fact patterns. Jason leverages his professional experience in complex commercial and securities litigation at an Am Law 100 firm and, prior to becoming a lawyer, as a documentary film producer to achieve successful results for his clients. His unique skillset of legal excellence and fact-based storytelling is a formidable combination in the courtroom.

In addition to practicing law, Jason is a lifelong community volunteer. He has served on numerous non-profit boards and public commissions, often in leadership positions. In 2022, Jason was elected to the Pasadena City Council, representing Pasadena’s District 7, home to the Pasadena Playhouse, Caltech, and Pasadena Community College, among other iconic Pasadena institutions. He is Pasadena’s first openly LGBTQ+ elected official. Jason is also actively engaged within Hahn & Hahn, where he has led a number of key initiatives to diversify and modernize the firm.


Representative Cases

Won $21 million arbitration award in partnership dispute involving general partner’s failure to distribute funds in accordance with partnership agreement 

Lead litigator representing major medical billing service provider in multi-million dollar breach of contract, conversion, and fraud claim against collection agency, resulting in Confession of Judgment and full restitution

Won a five-day trial as lead counsel defending a substantial family estate against a challenge to the legitimacy of its governing trust instrument and alleged malfeasance

Represented plaintiff professor in discrimination claim against private university resulting in substantial settlement

Devised successful pre-litigation risk mitigation strategy for high net-worth client in dispute with start-up business partner

Current matters include

Representation of medical partners in fraud and related claims against healthcare entity that acquired their practice

Shareholder derivative claims involving closely held family wholesale business

Defense of fraud and conversion claims in failed real estate venture

Defense of theft of trade secrets and related claims




California State Courts

U.S. Court of Appeals, Ninth Circuit

U.S. District Court, Central District of California

U.S. District Court, Northern District of California


University of California, Los Angeles School of Law, J.D. (UCLA Law Review; Michael T. Masin Scholar; Order of the Coif)

University North Carolina at Chapel Hill, B.A.


Author, "Revolution in Progress: Third-Party Funding of American Litigation," 58 UCLA L. REV. 571 (2010)

Honors & Awards

Awarded as "Diversity, Inclusion + Equity Community Impact Award" Honoree, Los Angeles Business Journal, 2024

Featured as “Diversity, Inclusion, Equity and Accessibility Visionary,” L.A. Times B2B Publishing, 2023

Recognized in “Business of Law: Legal Visionaries,” L.A. Times B2B Publishing, 2022

Selected to “Leaders of Influence: Litigators & Trial Attorneys,” Los Angeles Business Journal, 2021 and 2024

Selected to “Leaders of Influence: Minority Attorneys,” Los Angeles Business Journal, 2020 and 2022


“We tend to think of legal practice as an intellectual exercise, but great trial lawyers really thrive on emotional intelligence. My approach to litigation is equal parts strategy, psychology, and storytelling.”

D. Jason Lyon
Author Title
Community Involvement

Professional Organizations

American Bar Association
Member, 2011–present

Los Angeles County Bar Association
Member, 2011–present
Access to Justice Committee, 2016–2017

Pasadena Bar Association
Member, 2017–present

LGBT Bar Association
Member, 2011–present

City of Pasadena
Member, City Council, 2022–present
Member, Planning Commission, 2019–2022
Member, Board of Zoning Appeals, 2019–2022
Member, Historic Preservation Commission, 2018–2019

Planned Parenthood Pasadena and San Gabriel Valley
Member, Board of Directors, 2019–2022

San Gabriel Valley Economic Partnership
Member, Board of Directors, 2018–2020

Western Justice Center
General Counsel, 2018–2019

All Saints Pasadena
Senior Warden, 2016–2017
Junior Warden, 2015–2016
Vestry, 2013–2017

Young & Healthy
President, 2017–2019
Vice President, 2016–2017
Board of Directors, 2014-2019

City of Los Angeles
Vice Chair, Neighborhood Council Review Commission, 2006–2008
Member, East Los Angeles Area Planning Commission, 2004–2005
Co-Chair, Silver Lake Neighborhood Council, 2003–2005
Governing Board Member, Silver Lake Neighborhood Council, 2003–2007

Silver Lake Reservoirs Conservancy
Board Member, 2007–2008