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  • The Sacramento County Deputy Sheriffs' Association has utilized the services of Mastagni Holstedt, A Professional Corporation for over 30 years. During my tenure as Association President there has not been one situation that the firm could not handle... Read more >

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Mastagni Holstedt, A Professional Corporation
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Northern California Location
1912 I Street
Sacramento, CA 95811
916-446-4692 Phone
916-447-4614 Fax
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Southern California Location
9327 Fairway View Place, Suite 304
Rancho Cucamonga, CA 91730
909-477-8920 Phone
Other Locations in Whittier, Chico, Stockton and San Jose

Gregory J. Thoming

Gregory J. Thoming


Gregory J. Thoming is a Senior Associate in the labor department of Mastagni Holstedt, APC. Greg represents public safety officers and firefighters in labor matters, including administrative and disciplinary investigations and litigation, critical incident investigations, and criminal defense matters.

Greg worked for five years as a deputy public defender in the Central Valley and Southern California. He then worked at two firms in San Francisco for a dozen years, and became partner at one. His practice focused on civil litigation in the areas of employment, product liability, personal injury, and construction, and criminal defense. Most recently, Greg had his own law firm in San Francisco. His practice focused on criminal defense and business disputes.

Greg received his B.A from Stanford University and his J.D. from Santa Clara University School of Law.


  • J.D., Santa Clara University School of Law (1995)
  • B.A., Stanford University (1985)