Contact Form

Contact Us

In order to help you more quickly, please fill out the quick form and submit.

  • This field is for validation purposes and should be left unchanged.


  • 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 >

Contact Us

Mastagni Holstedt, A Professional Corporation
QR Code
Northern California Location
1912 I Street
Sacramento, CA 95811
916-446-4692 Phone
916-447-4614 Fax
Twitter Blog  Facebook
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

Sean D. Howell


Sean D. Howell is a Senior Associate with the Labor department of Mastagni Holstedt, A Professional Corporation

Sean represents public sector employees in administrative investigations, hearings, and civil litigation. He has been involved in mandamus actions to enforce rights under the Public Safety Officers Procedural Bill of Rights Act and has represented our peace officer clients in critical incident investigations. Sean also provides general counsel and contract negotiation services to several police labor associations.

Sean obtained his J.D. from Lincoln Law School. He was previously employed by the Placer County Facilitator’s Office, where he assisted unrepresented litigants with various issues related to family law and civil matters.


  • J.D., Lincoln Law School of Sacramento (2007)
  • B.A., Trinity College (1997)