Jon-Erik W. Magnus, Senior Associate

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Jon-Erik’s practice covers multiple areas of law with an emphasis on Construction, Environmental, Mold and Water Damage, and Toxic Tort law.  Jon-Erik graduated from Golden Gate University School of Law earning a Certificate of Specialization in Environmental Law with distinction. As a law student, Jon-Erik served as the Managing Editor of the Golden Gate University Environmental Law Journal. Jon-Erik’s article for the Journal, Lyon’s Roar, Then a Whimper: The Demise of Broad Arranger Liability in the Ninth Circuit After the Supreme Court’s Decision in Burlington Northern, has been cited as an authoritative piece on CERCLA arranger liability, including in briefs before the Ninth Circuit Court of Appeals and Roger’s Environmental Law, a treatise. Jon-Erik has also been a contributor to the Center on Urban Environmental Law’s blog.

Prior to law school, Jon-Erik worked for major insurance carriers and third-party administrators handling environmental, toxic tort and latent injury claims. Jon-Erik has significant experience handling multiparty environmental matters and coordinating litigation strategy with environmental investigations and cleanups. Further, Jon-Erik is very familiar with insurance coverage issues that are associated with latent injury and pollution claims.

Jon-Erik completed his undergraduate education at Skidmore College in Saratoga Springs, NY.  He is admitted to practice in the State of California and United States District Court, Northern District of California.


  • Golden Gate University School of Law (J.D., 2011)
  • Skidmore College, Saratoga Springs (B.A., 1997)


Practice Areas


  • Defense of developers and general contractors in construction defect litigation, ranging from single-family home litigations to large multi-party actions.


  • Defense of multi-party claims involving soil and groundwater contamination claims.
  • Coordinate site investigations and remediation programs.

Mold and Water Damage

  • Defense of claims involving residential and commercial property, including defense of personal injuries and property damage claims arising from exposure to mold and other mycotoxins.

Toxic Tort and Occupational Exposure

  • Defense of claims involving allegations of medical claims arising out of mold and other mycotoxins exposure.


Get in Touch

Northern California
  • Phone: (925) 222-3400
  • Fax: (925) 356-8250

1401 Willow Pass Road
Suite 700
Concord, CA 94520-5735