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About Us

Owner – Sherri D. Gastelum

Sherri Gastelum is the owner of Platinum Tax Defenders LLC and has been a Senior Business professional with 20+ years of experience in new business generation, corporate business including marketing, sales, relationship management and operations. Specialize in working in the accounting, tax and business consultancy field. Sherri has expertise working with clients and prospects to provide the best solution possible. Previously worked for PricewaterhouseCoopers, Deloitte, RSM McGladrey and others before starting her own tax resolution firm. Earned a BBA in Business from the University of Louisiana in Monroe, Louisiana. Has most recently been in charge of running the day to day operations of Platinum Tax Defenders LLC. Responsibilities include client acquisition, client service, and financial operations of the firm.

Platinum Tax Defenders was founded by Sherri Gastelum because there were so many firms that were taking people’s money but not providing the services. Sherri envisions Platinum Tax Defenders as the shining example of what a tax resolution firm should be.


Worldwide Who’s Who
Better Business Bureau
National Association of Professional Women
Valley Industry and Commerce Association
PWC Alumni Group

International Women’s Leadership Association
National Association of Women Business Owners
Association of Corporate Growth
Financial Executive Institute
Deloitte Alumni Group


  • Lifetime member of Worldwide Who's Who (WWW)
  • Top Female Executive in honor of outstanding professional excellence and dedication by WWW
  • Recognized as the 2013 Entrepreneur of the Year representing the Tax Industry by WWW
  • Woman of Outstanding Leadership recognized by the International Woman’s Leadership Association
  • "A" rating with the Better Business Bureau
  • Recognized as the Top Tax Firm in the Best of Magazines in Southern California Area

Director of Resolution – Angie Garcia, EA

Angie has over 5 years of experience in the tax resolution industry including volunteer work for the tax assistance program.  Angie has been a leader for hundreds of cases with particular expertise in negotiating on behalf of clients for protection against collection holds, wage garnishments and bank levies.  Angie earned a B.S. in Business Administration from Calfornia State University in Northridge.  

EA and Ex IRS Agent – Maurice Rossaler

Maurice Rosaler is an Enrolled Agent with over 27 years' experience in the tax resolution industry with over 18 years working at the Internal Revenue Service as a Senior Revenue Officer, Group Manager and Section Chief. He has extensive knowledge of the collections process, tax code and regulations necessary to investigate and resolve complex tax matters. After retiring with the IRS, Maurice spent the last 9 years working on the other side of the fence defending tax payers in resolving all matters of tax resolution.

Professional Activities

  • Member of the National Association of Enrolled Agents
  • Associate, Greater Los Angeles Federal Leadership Board
  • Los Angeles Electronic Federal Tax Payment System Coordinator
  • On-Job Instructor and computer resource contact
  • Member, I.R.S. Community Outreach Steering Committee
  • Formally assigned to Entertainment Specialty Group and International/Offshore Divisions