Atty. Gregory Joseph McMahon

Atty. Gregory Joseph McMahon

Gregory Joseph McMahon is a lawyer practicing corporate & incorporation, project finance and infrastructure, alternative energy projects and 4 other areas of law. Gregory received a B.A. degree from State University of New York at Binghamton in 1987, and has been licensed for 35 years.

New York New York 35 yrs experience 35 year
Call (646) 797-2069 Book Appointment

Profile Summary

About Gregory Joseph McMahon at a glance

Gregory Joseph McMahon is a Counsel based in New York, New York, practicing at Sidley Austin LLP. They have 35+ years of legal experience, licensed to practice since 1991. Their practice focuses on formation and energy. Admitted to practice in New York (1991). Educated at Cornell University Law School (J.D., 1990) and State University of New York at Binghamton (B.A., 1987). Serands clients in New York, NY and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Gregory Joseph McMahon is a lawyer practicing corporate & incorporation, project finance and infrastructure, alternative energy projects and 4 other areas of law
  • Gregory received a B.A. degree from State University of New York at Binghamton in 1987, and has been licensed for 35 years
  • Gregory practices at Sidley Austin LLP in New York, NY

Practice Areas Explained

Gregory Joseph McMahon's Areas of Practice

Each practice area below reflects the types of cases Gregory Joseph McMahon handles, with a brief overview of what that area of law covers.

Business Formation

Gregory Joseph McMahon is one of 35,584 formation attorneys indexed nationally. Browse formation attorneys in New York →

Energy & Utilities Law

Energy attorneys for oil & gas, renewables, utility regulation, and energy sector transactions.

Gregory Joseph McMahon is one of 36,230 energy attorneys indexed nationally. Browse energy 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 Gregory Joseph McMahon

Where is Gregory Joseph McMahon's law office located?
Gregory Joseph McMahon'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 Gregory Joseph McMahon handle?
Gregory Joseph McMahon focuses on formation, energy. Each practice area listed reflects experience handling cases of that type in New York.
How long has Gregory Joseph McMahon practiced law?
Gregory Joseph McMahon has 35+ years of legal experience and has been licensed since 1991.
Where did Gregory Joseph McMahon go to law school?
Gregory Joseph McMahon earned their education at (J.D., 1990); (B.A., 1987).
How can I contact Gregory Joseph McMahon for a consultation?
You can contact Gregory Joseph McMahon 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.
Cornell University Law School
- 1990
B.A.
State University of New York at Binghamton
- 1987

Bar Admissions

New York
Admitted: 1991

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