Heather K. Thielen - Simi Valley, CA
Attorney at Rossi Law Group
Workers' Compensation Lawyers in Simi Valley, CA
4119 Guardian St. Simi Valley, CA 93063
Simi Valley Workers' Compensation Lawyer
Updated: 03/10/2026
Areas of Practice
- Workers' Compensation
Attorney Information
Overview
Heather Thielen is a Senior Attorney at Rossi Law Group, where she has practiced since joining the firm in 2018. She has extensive experience defending workers’ compensation matters at all stages of litigation and regularly appears before multiple WCAB offices, including Santa Barbara, Oxnard, Bakersfield, Van Nuys, Marina del Rey, Long Beach, Los Angeles, and Anaheim.
Heather earned her undergraduate degree from the University of California, Santa Barbara. She began her legal career working for an applicant-side firm while attending law school. After passing the California Bar, Heather became an associate attorney working in-house for a major insurance company. She later practiced at a large private law firm, where she gained substantial experience handling workers’ compensation cases from inception through resolution, including deposing applicants and medical providers, analyzing and rating medical reports, and representing a variety of insurance carriers before the WCAB.
Heather is admitted to practice before all California state courts and the U.S. District Court for the Central District of California. In addition to her litigation practice, she serves as an adjunct law professor, teaching legal writing to first-year law students.
Heather is also a founding member of Backyard Breasties, a nonprofit organization dedicated to supporting women during and after their breast cancer journey.
Outside of her practice, Heather enjoys reading, yoga, travel soccer, and spending time with her husband and two children.
Education
-
Legal Education
-
University of California Law School
J.D.
-
University of California Law School
Current Employment Position(s)
-
Senior Attorney
Bar Admissions
- California
- U.S. District Court Central District of California
Contact
4119 Guardian St.
Simi Valley, CA 93063
Phone: 805-436-6840
Fax: 805-246-1545
Email: Send a message
Website: https://www.rossilawgroup.com
Hours: Monday - Friday ; 8:30 am - 5:30 pm
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