Atty. Mark Thomas Shehan

Atty. Mark Thomas Shehan

Mark Thomas Shehan is a lawyer practicing mergers & acquisitions, financial markets and services, venture capital and 4 other areas of law. Mark received a B.A. degree from Fordham University in 1970, and has been licensed for 51 years.

New York New York 51 yrs experience 51 year
Call (848) 295-4186 Book Appointment

Profile Summary

About Mark Thomas Shehan at a glance

Mark Thomas Shehan is a Counsel based in New York, New York, practicing at Sidley Austin LLP. They have 51+ years of legal experience, licensed to practice since 1975. Their practice focuses on business, m&a, and securities. Admitted to practice in New York (1975) and U.S. District Court, Eastern and Southern Districts of New York and U.S. Court of Appeals, Second Ci (1975). Educated at University of Virginia School of Law (J.D., 1974) and Fordham University (B.A., 1970). Serands clients in New York, NY and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Mark Thomas Shehan is a lawyer practicing mergers & acquisitions, financial markets and services, venture capital and 4 other areas of law
  • Mark received a B.A. degree from Fordham University in 1970, and has been licensed for 51 years
  • Mark practices at Sidley Austin LLP in New York, NY

Practice Areas Explained

Mark Thomas Shehan's Areas of Practice

Each practice area below reflects the types of cases Mark Thomas Shehan 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 Thomas Shehan is one of 501,317 business attorneys indexed nationally. Browse business attorneys in New York →

Mergers & Acquisitions

Mark Thomas Shehan is one of 49,731 m&a attorneys indexed nationally. Browse m&a attorneys in New York →

Securities Law

Mark Thomas Shehan is one of 64,529 securities attorneys indexed nationally. Browse securities attorneys in New York →

Jurisdictional Context

Why local counsel matters in New York

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

Looking for additional New York attorneys? Browse all attorneys in New York or all attorneys in New York.

Frequently Asked

Common questions about Mark Thomas Shehan

Where is Mark Thomas Shehan's law office located?
Mark Thomas Shehan's law practice is located in New York, New York. The firm is Sidley Austin LLP. You can contact the office directly through this profile page.
What practice areas does Mark Thomas Shehan handle?
Mark Thomas Shehan focuses on business, m&a, securities. Each practice area listed reflects experience handling cases of that type in New York.
How long has Mark Thomas Shehan practiced law?
Mark Thomas Shehan has 51+ years of legal experience and has been licensed since 1975.
Where did Mark Thomas Shehan go to law school?
Mark Thomas Shehan earned their education at (J.D., 1974); (B.A., 1970).
How can I contact Mark Thomas Shehan for a consultation?
You can contact Mark Thomas Shehan 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.
University of Virginia School of Law
- 1974
B.A.
Fordham University
- 1970

Bar Admissions

New York
Admitted: 1975
U.S. District Court, Eastern and Southern Districts of New York and U.S. Court of Appeals, Second Ci
Admitted: 1975

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