Our firm was formed in 1993 with the vision of achieving justice and results for injury victims. Since then we have successfully handled simple and complex injury cases ranging from rear end auto accidents to national class action settlements. We specialize in truck cases, having achieved superior results in dozens of big rig accidents. Our excellent office staff and support team help us thoroughly prepare every case to win at arbitration, mediation or jury trial.
At Demas & Rosenthal, LLP, we care about providing personal service to our clients. We feel it is essential to effective representation to know our client on a personal level. For us, personal service means always returning client calls, and always keeping the client informed about their case.
John N. Demas, Esq.

Mr. Demas is a founding partner of Demas & Rosenthal, LLP. He has been exclusively representing injured victims for nearly twenty years. He has successfully litigated and settled hundreds of personal injury cases and has extensive trial experience, with several multi-million dollar verdicts, including one of the largest verdicts ($4,500,000) ever against Sacramento County and the largest verdict in Tuolumne County ($2,500,000). He was recently recognized as the Trial Lawyer/Advocate of the Year by the Capitol City Trial Lawyers Association in recognition for his “extraordinary trial results and intrepid work in advocating the rights of consumers.” In addition, he has been selected as a Northern California Super Lawyer for 2009 & 2010, an exclusive honor limited to less than 5% of all attorneys and approximately 1% of plaintiff personal injury attorneys. He is also a member of The Justice Roundtable, an organization consisting of 100 of the nation’s top personal injury attorneys. Mr. Demas also has a 10/10 rating, the highest possible rating, with the prominent attorney ranking web site, Avvo.com.

He is very active in the legal community and is Past-President of the Capitol City Trial Lawyers Association as well as a Board Member of the Consumer Attorneys of California. He is a frequent speaker and lecturer at seminars and conventions at the local and State level. Mr. Demas also serves as a Settlement Conference Judge Pro Tem and Arbitrator in Sacramento County and as a Mediator for El Dorado County and Placer County. Mr. Demas is a graduate of the University of Pacific, and McGeorge School of Law, with Distinction. In his spare time, he likes to spend time with his family, exercise, cycle, scuba dive, hike and enjoys traveling. He was born in Greece and speaks Greek fluently.
Education & Certification
- University of the Pacific, McGeorge School of Law (J.D. 1992 With Distinction)
- University of the Pacific (B.A. Political Science, 1989)
Bars and Courts
- State Bar of California (1992)
- U.S. District Court, Eastern District of California (1992)
Professional Affiliations
- Past-President, Capital City Trial Lawyers Association
- Board Member, Consumer Attorneys of California
- American Association of Justice
- Settlement Conference Judge Pro Tem, Sacramento County
- Mediator, Placer & El Dorado County
- Arbitrator, Sacramento County
- Frequent lecturer and speaker at attorney seminars and conventions
Honors & Awards
- Trial Lawyer/Advocate of the Year, Capital City Trial Lawyers Association
- Trial Lawyer President of the Year
- Presidential Award for Merit, Consumer Attorneys of California
- Numerous academic awards & scholarships
- Recipient of American Jurisprudence Awards
- Law Journal Editor
- International Moot Court Honors Board
Areas of Practices
- Personal Injury
- Wrongful Death
- Catastrophic Injuries
- Products Liability
- Insurance Bad Faith
- Elder Abuse
Contact John Demas
S. David Rosenthal, Esq.

Mr. Rosenthal was born in San Francisco and grew up in the Bay Area. After obtaining a B.A. in political science at Long Beach State, he settled in Sacramento to attend McGeorge School of Law and be near his hobby, team roping (rodeo). After graduating in the top 3rd of his law school class, Mr. Rosenthal worked for a private civil litigation firm for one year before opening his own practice. He soon teamed up with law school classmates and built a successful practice specializing in the representation of those injured through the carelessness of others. With Demas & Rosenthal, he proudly carries on the tradition of excellence in advocacy for injured consumers. He is a member of the Association of Trial Lawyers of America, Consumer Attorneys of California, and volunteers as a Judge Pro Tem with the Sacramento County Superior Courts.
Education & Certification
- California State University, Long Beach, B.A., 1989
- University of the Pacific, McGeorge School of Law, J.D., 1992
Bars and Courts
- State Bar of California (1992)
- U.S. Federal District Court, Eastern District of California (1992)
Affiliations
- Association of Trial Lawyers of America
- Consumer Attorneys of California
- Consumer Attorneys of Sacramento
Honors & Awards
- International Moot Court Competition, Finalist
Areas of Practices
- Tort Law- Personal Injury









