Atty. Daniel L. Osier

Atty. Daniel L. Osier

Daniel Osier is a senior associate and trial lawyer in the civil litigation department of Mastagni Holstedt, APC His practice focuses on complex civil litigation, catastrophic personal injury, wrongful death, and employment matters. Mr.

Pleasanton Pleasanton 17 yrs experience 17 year
Call (916) 446-4692 Book Appointment

Profile Summary

About Daniel L. Osier at a glance

Daniel L. Osier is a Senior Associate based in Pleasanton, California. They haand 17+ years of legal experience, licensed to practice since 2009. Admitted to practice in California (2009). Educated at Santa Clara University School of Law (J.D., 2009) and San Diego State University (B.S., 2006). Serands clients in Pleasanton, CA and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Daniel Osier is a senior associate and trial lawyer in the civil litigation department of Mastagni Holstedt, APC His practice focuses on complex civil litigation, catastrophic personal injury, wrongful death, and employment matters
  • Mr. Osier has been selected for inclusion in Northern California’s Super Lawyers, Rising Stars, annually for the last 4 years
  • He has successfully represented clients in matters ranging from motor vehicle collisions, premises liability, medical malpractice, insurance coverage disputes, products liability, government tort claims, Cal/OSHA workplace incidents, serious and willful misconduct petitions (Labor Code §4553), and employment disputes
  • Mr. Osier has provided workshops to union clients on legal matters such as the “Firefighter Rule” (Civil Code §1714.9), insurance coverage issues, workers’ compensation/employer third-party lien and credit rights, employer negligence, and peace officer (Pitchess) privacy rights
  • He has also taught continuing legal education courses on civil procedure and discovery in state courts, as well as handling personal injury/workers’ compensation crossover cases and the legal issues arising from workplace injuries due to third party negligence
  • Mr. Osier is a graduate of Santa Clara University School of Law (J.D. 2009) and San Diego State University (B.S. 2006)
  • He is a native of Yolo County and currently lives in Davis with his wife and three children
  • Awards • Rated by Super Lawyers – (Selected to Northern CA Super Lawyers Rising Stars, 2017-2020) • Sacramento Magazine 2020 – Top Lawyers Memberships: • State Bar of California • Sacramento County Bar Association • Capitol City Trial Lawyers Association

Jurisdictional Context

Why local counsel matters in California

Practforg law in California. Legal matters in California are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantiand law. Cases originating in Pleasanton are typically filed in the local municipal court or the appropriate California state district court, depending on subject matter and amount in controversy. An attorney licensed in California brings working knowledge of local procedural deadlines, judicial practices in this andnue, and the substantiand law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in California courts without local counsel or pro hac vice admission.

Looking for additional California attorneys? Browse all attorneys in Pleasanton or all attorneys in California.

Frequently Asked

Common questions about Daniel L. Osier

Where is Daniel L. Osier's law office located?
Daniel L. Osier's law practice is located in Pleasanton, California. You can contact the office directly through this profile page.
How long has Daniel L. Osier practiced law?
Daniel L. Osier has 17+ years of legal experience and has been licensed since 2009.
Where did Daniel L. Osier go to law school?
Daniel L. Osier earned their education at (J.D., 2009); (B.S., 2006).
How can I contact Daniel L. Osier for a consultation?
You can contact Daniel L. Osier directly through this profile page. Click "Ask the Attorney" to submit a question, or "Schedule a Consultation" to book a meeting. Most claimed-profile attorneys respond within one business day.

Education

J.D.
Santa Clara University School of Law
- 2009
B.S.
San Diego State University
- 2006

Bar Admissions

California
Admitted: 2009

Reviews

These reviews belong to platform users; they do not constitute advertisement or promotion for the attorney. Opinions are published for informational purposes only.

No reviews yet.