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.
Employment & Labor & More Attorney · Serving Pleasanton, CA · 17+ Years Experience
Profile Summary
About Daniel L. Osier at a Glance
Daniel L. Osier is a Senior Associate based in Pleasanton, California. They have 17+ years of legal experience, licensed to practice since 2009. Their practice focuses on wrongful termination, employment, and litigation. 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). Serves clients in Pleasanton, CA and the surrounding metropolitan area.
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About 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. 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
Practice Areas Explained
Daniel L. Osier's Areas of Legal Practice
Each practice area below reflects the types of cases Daniel L. Osier handles, with a practical overview of what that area of law involves and how it may apply to your situation in Pleasanton.
Wrongful Termination in Pleasanton
Daniel L. Osier is one of 6,861 wrongful termination attorneys indexed nationally. Browse wrongful termination attorneys in California →
Employment Law in Pleasanton
Employment lawyers represent workers in wrongful termination, discrimination, harassment, wage & hour disputes, and severance negotiations.
Daniel L. Osier is one of 167,770 employment attorneys indexed nationally. Browse employment attorneys in California →
Civil Litigation in Pleasanton
Civil litigation attorneys for breach of contract, business disputes, civil rights, and class action lawsuits.
Daniel L. Osier is one of 450,750 litigation attorneys indexed nationally. Browse litigation attorneys in California →
Jurisdictional Context
Why Local Counsel Matters in Pleasanton
Practicing law in California. Legal matters in California are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive 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 venue, and the substantive 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.
Pleasanton Courts and Legal Process
Choosing a Pleasanton-based attorney means your counsel already knows the local docketing timelines, preferred filing formats, and how individual judges typically rule on procedural motions — details that only come from practicing in this jurisdiction day after day. That local familiarity can translate to better strategy, faster filings, and fewer costly surprises.
Looking for additional California attorneys? Browse all attorneys in Pleasanton or all attorneys in California.
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Professional Profile
Why Clients in Pleasanton Choose Daniel L. Osier
Selecting an attorney is one of the most consequential decisions you can make when a legal matter arises. Below are the core qualities that distinguish Daniel L. Osier's practice in the field of wrongful termination, employment, and litigation.
Decade-Tested Legal Experience
Daniel L. Osier brings 17+ years of hands-on legal practice — enough to have navigated the recurring fact patterns, procedural traps, and negotiation dynamics that shape case outcomes.
Broad Practice Area Coverage
Covering wrongful termination, employment, and litigation, Daniel L. Osier can address the full spectrum of a client's legal needs without requiring referrals to separate specialists for each issue.
Local Presence in Pleasanton
A Pleasanton-based practice means Daniel L. Osier attends hearings in the same courthouses, knows the local clerks, and understands the unwritten scheduling norms that affect every case filed here.
Case Types
Common Legal Issues Daniel L. Osier Handles in Pleasanton
Below is a representative sample of the types of matters Daniel L. Osier has experience with under California law. If your situation involves one of these case categories, this attorney may be well positioned to help you understand your options.
This list is illustrative, not exhaustive. Contact Daniel L. Osier directly to discuss the specifics of your situation.
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How People Find Daniel L. Osier Online
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Daniel L. Osier's Practice Areas & Specializations
Education & Law School Background
Bar Admissions & Licensed Jurisdictions
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