Sion & Associates

Attorneys at Law

Advocators, Litigators, Educators

Concentrating on Workers' Compensation Defense

About Us

We are a community of professionals who enjoy our work, our clients, and our associations with each other.

Founded in 1998, our office concentrates on defending California employers in workers' compensation and related labor law matters. Located in Century City, California, we provide legal services to major corporations and other clients headquartered throughout the United States. We are proud of having distinguished our firm by working with our clients to assist in implementing safety prevention measures, investigating industrial injury and discrimination claims, reviewing medical protocol, and reviewing Return to Work policies. We emphasize an integrated approach to resolving industrial injury claims by requesting that employers and insurance carriers actively participate in the defense of claims, in an effort to reduce overall costs.

Our practice provides detailed and thorough representation regarding all aspects of industrial injury claims, from investigation to Trial. Our representation covers claims of orthopedic and psychiatric injuries, chemical and toxic exposure, discrimination actions under Labor Code Section 132a, as well as allegations of Serious and Willful violations. A staple of our practice is to apply civil litigation skills in the workers' compensation arena. Thus our Attorneys are trained to have a comprehensive understanding of California labor, litigation and other laws and regulations applicable to our business. We are solely dedicated to representing the employer side of workers' compensation matters. We actively track legislation pending before the California State Assembly and before the federal government. We issue periodic legislative updates to our clients, and our Attorneys are available to present seminars on workers' compensation and legislative issues.


Steven Mark Sion

Founder & Principal

Mr. Sion is a native of Providence, R.I., and is a past member of the Rhode Island State and District of Columbia Bar Associations. Mr. Sion joined the California Bar in 1991, and has practiced law in California since that time.

Mr. Sion studied at Providence College, the University of Fribourg (Switzerland) and New England School of Law. In Rhode Island, he worked in both civil litigation and workers’ compensation.

Prior to founding his own business in 1998, Mr. Sion was an Associate respectively at the law firms of Gilbert, Kelly, Crawley & Jennett, and Seyfarth, Shaw, Fairweather & Geraldson.

In addition to his practice, Mr. Sion actively pursues legislative advocacy on behalf of employers, and was thrice elected to annual terms as Chair of the Legislative Affairs Committee on the Board of Directors of the Professionals In Human Resources Association (PIHRA).

Rhiannon Hunsberger

Of Counsel

Rhiannon Hunsberger earned her Juris Doctor through Southwestern Law School’s accelerated two-year program in 2017 and was admitted to the California Bar in 2018. Prior to joining the Sion team, Ms. Hunsberger served as a Sergeant in the California Army National Guard Judge Advocate General's Corps for 13 years. Currently, she is a Loyola Law School Master of Laws candidate.

Administrative Team

If you are interested in joining our team, please send a cover letter and resume to

Firm Employer Guides & Presentations

An Employer's Guide to Return to Work Issues in California

Reform of the Reform Legislation: A Discussion of Senate Bill 863

Effective Workers' Compensation Claims Management: Minimizing Costs

The Spinal Surgery Guide

A New Day in California Workers' Compensation Laws


Sion & Associates

Attorneys at Law

Contact us today at
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Our Addresses

1880 Century Park East, Suite 617
Los Angeles, CA 90067
(310) 858-7500