Josephine K. Mason


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Litigation and Dispute Resolution
San Francisco

Josephine is an attorney in Hanson Bridgett's Appellate Practice Group, where she focuses on appeals and law and motion in the state and federal courts.

Before joining Hanson Bridgett, Josephine served as law clerk to the Honorable James L. Dennis on the U.S. Court of Appeals for the Fifth Circuit. She began her career as an appellate attorney at the national appellate litigation boutique Horvitz & Levy LLP, based in Southern California.

In addition to appellate litigation, Josephine has experience litigating complex and high-stakes business, commercial, securities, and environmental matters, including class actions and multidistrict litigation. Previously, she served on the litigation teams successfully representing State Attorneys General in complex matters, including the Deepwater Horizon litigation, of unprecedented scale. Josephine also maintains an active pro bono practice.


"Must One Contest a Tentative Ruling?," Appellate Insight Blog (February 2018)

"Masterpiece Cakeshop': Drawing Lines to Ensure Tolerance Runs in All Directions," co-author, The Recorder (December 2017)

"Peremptory Challenge Denied? Take a Writ," Appellate Insight Blog (November 2017)

"MCLE: SLAPP Update," co-author, California Lawyer (December 2012)

"Why we need a federal anti-SLAPP law," co-author, Daily Journal (June 2012)

"The Wide-Ranging Applications of California Anti-SLAPP Law," co-author, Law360: Expert Analysis (February 2012)

"The Standing Doctrine's Dirty Little Secret," co-author, 107 Nw. U. L. Rev. 169 (2012)

"Uncertainty looms over anti-SLAPP issues," co-author, Daily Journal (December 2011)

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Community Involvement

AIDS Legal Referral Panel (ALRP), Panel Attorney

Professional Affiliations

Queen’s Bench Amicus Committee, Co-Chair

U.C. Hastings Law Journal Alumni Board, Member

Judicial Clerkships

Law Clerk to the Honorable James L. Dennis, U.S. Court of Appeals for the Fifth Circuit (2012-2014)

Judicial Intern to the Honorable Edward Chen, U.S. District Court for the Northern District of California

Academic Distinction

Senior Articles Editor, Hastings Law Journal

Moot Court Board, Member


J.D., magna cum laude, University of California, Hastings College of the Law (2011)

B.A., summa cum laude, University of California, Berkeley (2008)

Admissions And Courts



San Francisco

415-995-5099 Direct Phone
415-995-3565 Fax

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