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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

John J. Bostanzoglou


John Bostanzoglou is an associate attorney in the Workers' Compensation department at Mastagni Holstedt, A Professional Corporation. He represents injured workers in all aspects of workers' compensation litigation, including hearings and trials, as well as Labor Code §132a discrimination and serious and willful misconduct claims.

Prior to joining Mastagni Holstedt, John also worked as an Applicant's Workers' Compensation associate attorney at Workers' Compensation Law Center in Redding, California, where he initially developed his enthusiasm for representing injured workers.

While working for the Sacramento County District Attorney's Office as a Certified Law Clerk, John regularly appeared on behalf of the People in a variety of proceedings and hearings before the Superior Court. During law school, he also served as an extern to the presiding judge of the Office of Administrative Hearings, Special Education Division and gained significant experience in the field of disability law at various nonprofit agencies.


  • J.D., Lincoln Law School of Sacramento (2015)
  • B.A., University of California, Davis (2005)