Experienced Trial, Antitrust, and Whistleblower Lawyers

WHAT WE DO

WORKING WITH YOU & FOR YOU

We’re a different kind of law firm. At Constantine Cannon, we listen. We apply our extensive legal knowledge and decades of experience. We work tirelessly for you from beginning to end. And together, we get results.

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Practice Groups

Antitrust Litigation & Counseling

Our attorneys are both experts in antitrust law and seasoned litigators. Our approach to every case, whether on the plaintiff’s side or the defense, is to be prepared to take the case to trial.

Whistleblower Representation

The Constantine Cannon Whistleblower Lawyer Team has extensive experience representing whistleblowers under the qui tam provisions of the False Claims Act, the Dodd-Frank Act, the IRS Whistleblower Law, and the wide array of other federal and state whistleblower reward laws.

Commercial Litigation

Constantine Cannon has broad experience representing plaintiffs and defendants in complex commercial litigations and arbitrations. Our reputation is built upon our central philosophy of aggressively and sensibly representing clients in all areas of commercial dispute.

Art & Cultural Property

We formed the Art and Cultural Property Law Group to make a total commitment to the art world. We pride ourselves in our knowledge of the art market, our legal expertise, our effectiveness, and our entrepreneurial spirit, which we share with many of our clients.

Compliance, Monitoring & Investigations

Constantine Cannon conducts efficient and effective internal reviews and investigations for its clients. We provide critical value by establishing the independence of investigations, a key issue both in seeking reduced penalties in criminal actions and in minimizing civil litigation exposure.

E-Discovery Counseling

Our e-discovery practice group, comprised of a dedicated team of attorneys, project managers, and legal technology specialists is at the forefront of e-discovery theory and practice. We work closely with our clients to tailor creative and flexible discovery plans that mitigate both costs and litigation risk.

Government Affairs

Constantine Cannon has extensive experience representing clients before numerous federal and state agencies, including the Department of Justice, the Federal Trade Commission, the Federal Communications Commission, the Federal Reserve Bank, and the Attorney General of every state active in antitrust enforcement.

Intellectual Property & Technology

We represent high technology companies in the consumer electronics, software, internet, webcasting, retail, and reprographics industries in a variety of matters involving copyright, trademark, trade secret, and patent law. We regularly practice before federal district courts and courts of appeals, as well as arbitrations, administrative agencies and tribunals.

Offices

NewYork
New York
Constantine Cannon

335 Madison Avenue, 9th Floor
New York, NY 10017
T:212.350.2700

DC
Washington D.C.
Constantine Cannon

1001 Pennsylvania Ave, NW, Suite 1300N
Washington, DC 20004
T:202.204.3500

sanfrancisco
San Francisco
Constantine Cannon

150 California Street, Suite 1600
San Francisco, CA 94111
T:415.639.4001

london
London
Constantine Cannon

Regulatory Information Privacy Policy Complaints Policy 90 Bartholomew Close London EC1A 7BN
T:+44 (0)20 3959 0700

Latest News, Publications & Speeches

Jun102021
So, the Supreme Court Preserves Security Research from the CFAA
Seth D. Greenstein

Partner Seth Greenstein published an article in the Disruptive Competition blog, So, the Supreme Court Preserves Security Research from the CFAA (June 9, 2021).  Click...

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Jun102021
June 10, 2021

Partner Matthew Cantor will be a panelists at the June 17, 2021 Federal Bar Council webinar titled, Antitrust & Big Tech. Click here to read...

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Constantine Cannon “can claim to have won two of the three largest antitrust settlements in U.S. history.” – Global Competition Review, 2012

Jun12021
Constantine Cannon Partner Ethan Litwin Recognized in 2021 Chambers USA Guide

Constantine Cannon LLP congratulates Ethan Litwin on being ranked by Chambers USA as a leading antitrust attorney in New York in the 2021 legal guide.  The...

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Constantine Cannon Named National Tier-1 “Best Law Firm” for Antitrust Law and Antitrust Litigation – U.S. News Best Lawyers 2020

May62021
Buying and Selling Art in the Era of Covid-19
Azmina Jasani

Bringing her two worlds together, Azmina provided a legal perspective from both New York and London at the Federal Bar Association’s Virtual Art Law Conference....

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