Sipsas P.C.


Sipsas P.C. is a full service boutique law firm based in New York City. We represent individuals and small-to-medium sized businesses in transactions, litigation, global trade law and chemical regulatory compliance.


Sipsas P.C. acts as de facto General Counsel for our clients, advising on all matters through the business lifecycle.
  • business formation (corporations, partnerships, LLCs, nonprofits)
  • commercial leases
  • contracts
  • copyrights & trademarks
  • licensing
  • mergers & acquisitions
  • real estate transactions.


Sipsas P.C. has successfully litigated and defended cases in federal and state courts throughout New York,
  • breach of contract
  • breach of fiduciary duty
  • business bankruptcy and liquidation
  • construction disputes
  • insurance coverage disputes
  • international trade disputes
  • partnership disputes
  • negligence
  • real estate conflicts
  • technology and intellectual property issues.

Global Trade Law

Sipsas P.C. provides legal counsel in administrative proceedings and international and trade regulation matters.

Chemical Regulatory Compliance

Sipsas P.C. serves as a trusted advisor to chemical and plastics companies on statutory matters,
  • the Toxic Substances Control Act (TSCA)
  • the Federal Insecticide, Fungicide and Rodenticide Act (FIFRA)/the Food Quality Protection Act (FQPA)
  • Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH).

John Sipsas

Founder and Principal Attorney

Ioannis (John) P. Sipsas is the founder and principal attorney of Sipsas P.C. Mr. Sipsas focuses his practice on business law, international trade matters and commercial litigation. He is admitted to practice in the State of New York, before the United States Court of International Trade and the United States Southern and Eastern District Federal Courts of New York and The United States of the Court of Appeals for the Second Circuit.

Matthew London

Associate Attorney

Matthew London is an Associate Attorney at Sipsas P.C. He is admitted to practice law in New York State. Mr. London earned a BA in History and Chinese Language from Hofstra University and a JD from New York Law School.

Maria Gina Nikolaou

Associate Attorney

Gina Nikolaou is an Associate at Sipsas P.C. She is admitted to practice law in New York, and New Jersey. Ms. Nikolaou is also admitted to practice at the United States District Court of New Jersey. She earned a J.D. from New York Law School and a B.A. in Government and Politics from St. John’s University. Ms. Nikolaou is fluent in Greek.
Sipsas P.C. is a New York City law firm specializing in business law and commercial litigation. Our clients are businesses and entrepreneurs across a wide variety of industries. We vigorously defend our clients against frivolous and malicious lawsuits and aggressively pursue litigation against individuals and other businesses. We are located in Astoria, Queens, minutes from Midtown Manhattan, and serve clients in the five boroughs, Long Island and Westchester.


  •  718-777-0909
  •   31-16 30th Avenue, Suite #201 Astoria, New York 11102
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With an emphasis on representing real estate developers, architectural engineers, construction companies, general contractors, and small and mid-sized business owners, Sipsas P.C. has successfully litigated and defended cases in federal and state court throughout New York, including cases involving breaches of contract, breaches of fiduciary duty, employment disputes, business dissolutions, business relationship interferences, franchise issues, shareholder issues, partnership disputes, insurance coverage disputes, technology and intellectual property issues, and many other business conflicts.
Contact Sipsas P.C. today to schedule a time to meet with one of our attorneys for a free business legal needs assessment.