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.
Financial Markets And Services & More Attorney · Serving New York, NY · 51+ Years Experience
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). Serves clients in New York, NY and the surrounding metropolitan area.
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About 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
- Mark practices at Sidley Austin LLP in New York, NY
Practice Areas Explained
Mark Thomas Shehan's Areas of Legal Practice
Each practice area below reflects the types of cases Mark Thomas Shehan handles, with a practical overview of what that area of law involves and how it may apply to your situation in New York.
Business & Corporate Law in New York
Business attorneys advise founders and growing companies on entity formation, contracts, financing, M&A, and dispute resolution.
Mark Thomas Shehan is one of 497,491 business attorneys indexed nationally. Browse business attorneys in New York →
Mergers & Acquisitions in New York
Mark Thomas Shehan is one of 49,430 m&a attorneys indexed nationally. Browse m&a attorneys in New York →
Securities Law in New York
Mark Thomas Shehan is one of 64,075 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 venue, 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.
New York Courts and Legal Process
Choosing a New York-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.
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Professional Profile
Why Clients in New York Choose Mark Thomas Shehan
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 Thomas Shehan's practice in the field of business, m&a, and securities.
Decade-Tested Legal Experience
Mark Thomas Shehan brings 51+ 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 U.S. District Court, Eastern and Southern Districts of New York and U.S. Court of Appeals, Second Ci, Mark Thomas Shehan can represent clients in cases that span state lines or require counsel in multiple jurisdictions.
Broad Practice Area Coverage
Covering business, m&a, and securities, Mark Thomas Shehan can address the full spectrum of a client's legal needs without requiring referrals to separate specialists for each issue.
Local Presence in New York
A New York-based practice means Mark Thomas Shehan 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 Thomas Shehan Handles in New York
Below is a representative sample of the types of matters Mark Thomas Shehan has experience with under New York 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 Thomas Shehan directly to discuss the specifics of your situation.
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How People Find Mark Thomas Shehan Online
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Mark Thomas Shehan's Practice Areas & Specializations
Education & Law School Background
Bar Admissions & Licensed Jurisdictions
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