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

90 Bartholomew Close
London EC1A 7BN
T:+44 (0)20 3959 0700

Latest News, Publications & Speeches

June 30, 2020

Ari Yampolsky quoted in Reuters article "DOJ: False Claims Act whistleblowers must disclose litigation funding."  (login required)

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Jun302020
Constantine Cannon Attorneys Provide Comments on Model Whistleblower Award and Protection Act
Eric R. Havian, Michael Ronickher, Chris McLamb

The North American Securities Administrators Association (NASAA) has proposed a Model Whistleblower Award and Protection Act that would serve as a guide for states across...

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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

Jun252020
Constantine Cannon Announces $57 Million Whistleblower Settlement with the Largest Not-For-Profit Home Health Care Agency in the United States

The Visiting Nurse Service of New York settles False Claim Act lawsuit alleging it failed to provide home health care visits and services to tens...

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Constantine Cannon Named National Tier-1 “Best Law Firm” for Antitrust Law and Antitrust Litigation – U.S. News Best Lawyers 2019

June 23, 2020

Ari Yampolsky was quoted in the Courthouse News Service article, State Officials Can’t Use Immunity to Dodge Fraud Claims, Panel Rules.  Click here to read the article.  

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