Atty. Mark Casillas
Mark Casillas is a lawyer practicing corporate law, securities, business law and 1 other area of law. Mark received a degree from Loyola Marymount University, Los Angeles CA, and has been licensed for 44 years.
Business Law & More Attorney · Serving Tiburon, CA · 44+ Years Experience
Profile Summary
About Mark Casillas at a Glance
Mark Casillas is a business, securities, and litigation attorney based in Tiburon, California. They have 44+ years of legal experience, licensed to practice since 1982. Admitted to practice in New York (1982) and California (1983). Educated at Loyola Marymount University, Los Angeles CA Loyola University (B.A. Harvard, 1976). Serves clients in Tiburon, CA and the surrounding metropolitan area.
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About Mark Casillas
- Mark Casillas is a lawyer practicing corporate law, securities, business law and 1 other area of law
- Mark received a degree from Loyola Marymount University, Los Angeles CA, and has been licensed for 44 years
- Mark practices in Tiburon, CA
Practice Areas Explained
Mark Casillas's Areas of Legal Practice
Each practice area below reflects the types of cases Mark Casillas handles, with a practical overview of what that area of law involves and how it may apply to your situation in Tiburon.
Business & Corporate Law in Tiburon
Business attorneys advise founders and growing companies on entity formation, contracts, financing, M&A, and dispute resolution.
Mark Casillas is one of 497,491 business attorneys indexed nationally. Browse business attorneys in California →
Securities Law in Tiburon
Mark Casillas is one of 64,075 securities attorneys indexed nationally. Browse securities attorneys in California →
Civil Litigation in Tiburon
Civil litigation attorneys for breach of contract, business disputes, civil rights, and class action lawsuits.
Mark Casillas is one of 450,750 litigation attorneys indexed nationally. Browse litigation attorneys in California →
Jurisdictional Context
Why Local Counsel Matters in Tiburon
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 Tiburon 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.
Tiburon Courts and Legal Process
Choosing a Tiburon-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 Tiburon or all attorneys in California.
Frequently Asked
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Professional Profile
Why Clients in Tiburon Choose Mark Casillas
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 Mark Casillas's practice in the field of business, securities, and litigation.
Decade-Tested Legal Experience
Mark Casillas brings 44+ years of hands-on legal practice — enough to have navigated the recurring fact patterns, procedural traps, and negotiation dynamics that shape case outcomes.
Multi-State Bar Admission
Licensed in New York and California, Mark Casillas can represent clients in cases that span state lines or require counsel in multiple jurisdictions.
Broad Practice Area Coverage
Covering business, securities, and litigation, Mark Casillas can address the full spectrum of a client's legal needs without requiring referrals to separate specialists for each issue.
Local Presence in Tiburon
A Tiburon-based practice means Mark Casillas 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 Mark Casillas Handles in Tiburon
Below is a representative sample of the types of matters Mark Casillas 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 Mark Casillas directly to discuss the specifics of your situation.
Search Reference
How People Find Mark Casillas Online
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Mark Casillas's Practice Areas & Specializations
Education & Law School Background
Bar Admissions & Licensed Jurisdictions
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