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  3. | John J. Bartko

John J. Bartko

Founder

San Francisco

  • 415.956.1900
  • 415.291.4515
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  • Experience
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John J. Bartko is a Founder and Partner of Bartko Pavia LLP and has decades of experience representing both plaintiffs and defendants in complex civil, criminal, and regulatory matters.  His experience includes representing various parties in complicated financial fraud and environmental law cases. John has represented many executives ensnared in regulatory investigations and is recognized as a leading white collar criminal defense attorney, most notably as lead trial counsel in a criminal antitrust case where he successfully defended a U.S. executive accused of international price fixing even though the government had obtained 17 guilty pleas from other defendants. One of his trials was nationally televised on Court TV.

John also has significant international experience, having been involved in international discovery and complex investigations requiring foreign court appearances, including conducting examinations in Switzerland and Japan through pioneering requests for civil judicial assistance. He has traveled to Europe, Asia, and South Africa to obtain evidence for American civil and criminal proceedings and has represented foreign officials in U.S. legal matters.

John’s recent arbitrations include the representation of a technology company’s founders against purchasers and financial advisors in claims arising from exit strategies. John has also represented U.S. companies in claims arising from international transactions involving joint ventures and real estate investments. In shareholder cases, John has represented corporations, directors, officers, and shareholders in antitrust, finance, real estate, technology, and other businesses and in state and federal litigation and governmental investigations. In addition, he has represented clients in professional malpractice claims and in other litigation concerning the departure of officers, partners, and shareholders.

Credentials

Education

  • University of California, Berkeley, School of Law, J.D.
  • University of California, Los Angeles, B.A.

Bar Admissions

  • State Bar of California

Court Admissions

  • United States Court of Appeals for the Ninth Circuit
  • United States District Court for the Northern District of California
  • United States District Court for the Eastern District of California
  • United States District Court for the Southern District of California
  • United States District Court for the Central District of California
  • United States District Court for the District of Hawaii

Recognitions

  • Named as a Northern California Super Lawyer (2005-2025)
  • Recognized by “Best Lawyers,” Commercial Litigation and White Collar Criminal Defense (2013-2025)
  • Martindale-Hubbell Peer Review, AV Rating, 5 Stars  

Experience

  • John successfully represented landowners in pioneering environmental regulation matters resolved by the U.S. Supreme Court in Lake County Estates v. Tahoe Reg. Planning Agency, 440 U.S. 391 (1979).

Insights

Honors and Awards

01, January 2025

Bartko Pavia Attorneys Recognized as Best Lawyers® Award Recipients

We’re proud to announce that four Bartko Pavia attorneys have been named in the 2025 edition of The Best Lawyers in America®. Best Lawyers is the oldest and most respected lawyer ranking service, using a peer-review process to ensure credibility and trust. Since it was first published in 1983, Best Lawyers has become universally regarded as the definitive guide to legal excellence.

Honors and Awards

10, November 2023

Five Bartko Pavia Lawyers Recognized as 2024 Best Lawyers® Award Recipients

Bartko LLP is pleased to announce that five lawyers have been included in the 2024 edition of The Best Lawyers in America®. Since it was first published in 1983, Best Lawyers has become universally regarded as the definitive guide to legal excellence.

Publications

  • John’s many speaking appearances include presentations at the American Law Institute, American Bar Association, and Practicing Law Institute where he discussed internal corporate investigations, international discovery, and trial practice.

Areas of Focus

Practices

  • Intellectual Property
  • Litigation

Industries

  • Financial Services
  • Technology

Insights & News

Press Release

30, October 2025

An Ruda Serves as Judge at the Berkeley Female Founders & Funders Summit

Learn more

Honors and Awards

17, May 2023

Patrick M. Ryan Ranked Top IP Lawyer

Learn more

Media Mentions

27, October 2025

Steve Vieux Featured in Law360 Coverage of the California Lawyers Association’s Golden State Institute

Learn more

Press Release

17, December 2025

Bartko Pavia Elevates Four Attorneys to Partnership

Learn more

Honors and Awards

26, November 2025

Patrick M. Ryan Named to Daily Journal’s 2025 “Top Antitrust Lawyers” List

Learn more

Honors and Awards

23, September 2025

Patrick M. Ryan Earns Repeat Recognition as 2025 Top 100 Lawyer

Learn more

Media Mentions

30, May 2025

Zest Labs $222M Verdict Gains Widespread Media Coverage

Learn more

Honors and Awards

01, January 2025

Bartko Pavia Earns Recognition in 2025 Best Law Firms® Rankings

Learn more

Press Release

31, May 2019

Bartko Pavia Firm Obtains $845,114,000 Judgment for ASML Against XTAL, Inc.

Learn more

Press Release

01, August 2025

Bartko Pavia Continues Strategic Expansion with Addition of Antitrust Partner Ian Papendick

Learn more

Media Mentions

05, February 2024

Bartko Pavia Obtains Defense Win in Uber Trade Secret Case

Learn more

Honors and Awards

24, January 2024

Patrick M. Ryan Named Leading Commercial Litigator

Learn more

Press Release

14, May 2025

Bartko Pavia’s Patrick M. Ryan obtains $222 million jury verdict against Walmart

Learn more

Honors and Awards

08, November 2023

Bartko Pavia Ranked Top Litigation Boutique

Learn more

Press Release

11, March 2022

Bartko Pavia Scores Huge Defense Jury Verdict in $411 Million Sutter Health Antitrust Class Action

Learn more

Press Release

07, February 2023

Bartko Pavia Clients Win $680 Million Francesca Naify Case

Learn more

Press Release

30, October 2025

An Ruda Serves as Judge at the Berkeley Female Founders & Funders Summit

Learn more

Honors and Awards

17, May 2023

Patrick M. Ryan Ranked Top IP Lawyer

Learn more

Media Mentions

27, October 2025

Steve Vieux Featured in Law360 Coverage of the California Lawyers Association’s Golden State Institute

Learn more

Press Release

17, December 2025

Bartko Pavia Elevates Four Attorneys to Partnership

Learn more

Honors and Awards

26, November 2025

Patrick M. Ryan Named to Daily Journal’s 2025 “Top Antitrust Lawyers” List

Learn more

Honors and Awards

23, September 2025

Patrick M. Ryan Earns Repeat Recognition as 2025 Top 100 Lawyer

Learn more

Media Mentions

30, May 2025

Zest Labs $222M Verdict Gains Widespread Media Coverage

Learn more

Honors and Awards

01, January 2025

Bartko Pavia Earns Recognition in 2025 Best Law Firms® Rankings

Learn more

Press Release

31, May 2019

Bartko Pavia Firm Obtains $845,114,000 Judgment for ASML Against XTAL, Inc.

Learn more

Press Release

01, August 2025

Bartko Pavia Continues Strategic Expansion with Addition of Antitrust Partner Ian Papendick

Learn more

Media Mentions

05, February 2024

Bartko Pavia Obtains Defense Win in Uber Trade Secret Case

Learn more

Honors and Awards

24, January 2024

Patrick M. Ryan Named Leading Commercial Litigator

Learn more

Press Release

14, May 2025

Bartko Pavia’s Patrick M. Ryan obtains $222 million jury verdict against Walmart

Learn more

Honors and Awards

08, November 2023

Bartko Pavia Ranked Top Litigation Boutique

Learn more

Press Release

11, March 2022

Bartko Pavia Scores Huge Defense Jury Verdict in $411 Million Sutter Health Antitrust Class Action

Learn more

Press Release

07, February 2023

Bartko Pavia Clients Win $680 Million Francesca Naify Case

Learn more

Press Release

30, October 2025

An Ruda Serves as Judge at the Berkeley Female Founders & Funders Summit

Learn more

Honors and Awards

17, May 2023

Patrick M. Ryan Ranked Top IP Lawyer

Learn more

Media Mentions

27, October 2025

Steve Vieux Featured in Law360 Coverage of the California Lawyers Association’s Golden State Institute

Learn more

View all Insights

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