Atty. Mark William Seneca

Atty. Mark William Seneca

Mark William Seneca is a lawyer practicing m&a and private equity, business law. Mark received a B.S. degree from Brigham Young University in 1990, and has been licensed for 30 years.

Menlo Park Menlo Park 30 Years Experience 30 year
Call (408) 869-0399

Profile Summary

About Mark William Seneca at a glance

Mark William Seneca is a Partner based in Menlo Park, California, practicing at Orrick, Herrington & Sutcliffe LLP. They have 30+ years of legal experience, licensed to practice since 1996. Their practice focuses on business and m&a. Admitted to practice in California (1996), Virginia (2002), and District of Columbia (2005). Educated at Stanford University Law School (J.D., 1995) and Brigham Young University (B.S. Stanford, 1990). Active member of Virginia State Bar State Bar of California The District of Columbia Bar. Serves clients in Menlo Park, CA and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Mark William Seneca is a lawyer practicing m&a and private equity, business law
  • Mark received a B.S. degree from Brigham Young University in 1990, and has been licensed for 30 years
  • Mark practices at Orrick, Herrington & Sutcliffe LLP in Menlo Park, CA

Practice Areas Explained

Mark William Seneca's Areas of Practice

Each practice area below reflects the types of cases Mark William Seneca handles, with a brief overview of what that area of law covers.

Business & Corporate Law

Business attorneys advise founders and growing companies on entity formation, contracts, financing, M&A, and dispute resolution.

Mark William Seneca is one of 452,854 business attorneys indexed nationally. Browse business attorneys in California →

Mergers & Acquisitions

Mark William Seneca is one of 45,724 m&a attorneys indexed nationally. Browse m&a attorneys in California →

Jurisdictional Context

Why local counsel matters in California

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 Menlo Park 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.

Looking for additional California attorneys? Browse all attorneys in Menlo Park or all attorneys in California.

Frequently Asked

Common questions about Mark William Seneca

Where is Mark William Seneca's law office located?
Mark William Seneca's law practice is located in Menlo Park, California. The firm is Orrick, Herrington & Sutcliffe LLP. You can contact the office directly through this profile page.
What practice areas does Mark William Seneca handle?
Mark William Seneca focuses on business, m&a. Each practice area listed reflects experience handling cases of that type in California.
How long has Mark William Seneca practiced law?
Mark William Seneca has 30+ years of legal experience and has been licensed since 1996.
Where did Mark William Seneca go to law school?
Mark William Seneca earned their education at (J.D., 1995); (B.S. Stanford, 1990).
How can I contact Mark William Seneca for a consultation?
You can contact Mark William Seneca 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.
Stanford University Law School
- 1995
B.S. Stanford
Brigham Young University
- 1990

Bar Admissions

California
Admitted: 1996
Virginia
Admitted: 2002
District of Columbia
Admitted: 2005

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