Mark D’Argenio has extensive experience defending clients in a wide variety of areas, including environmental, habitability, transportation, real estate disputes, and personal injury. In transportation matters, Mark has represented some of the nation's largest commercial trucking and common carriers, including through trial. Mark's in-depth environmental experience includes Clean Water Act litigation, CEQA disputes, wetlands negotiations, and Endangered Species Act claims. Mark also has a comprehensive habitability practice, in which he specializes in representing owners, landlords, and property managers in difficult jurisdictions. Mark's practice includes litigation, pre-litigation, and transactional assistance. His clients include national REITs, high-volume real estate brokers, and publicly traded builders and developers.

Mark has served for over ten years as an Adjunct Professor at UC Hastings College of the Law, where he teaches upper-division Appellate Advocacy. Mark also teaches legal writing classes at Santa Clara University Law School. While in law school, Mark won the National Moot Court Competition, the nation’s oldest and most prestigious moot court competition.



  • University of California Hastings Law School (J.D., 2005)
  • University of California, Berkeley (B.A., 2002)

Licensed to Practice in

  • California


Events, Seminars & Speaking Engagements

  • “Developments in Advanced Lawsuit Investigation” (Adjuster CE Webinar; February 20, 2019)
  • “Strategies for Effective Writing” (MCLE Seminar; May 24, 2017)
  • "SB 800 and the Right to Repair: Tips, Strategies, and Takeaways After Ten Years of Hands-On Experience" (North State BIA; May 1, 2015)

Honors & Recognitions

  • Super Lawyers Magazine “Southern California Rising Star,” 2015

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