John C. Quinn



  • B.A., Yale University, 2007
  • J.D., Harvard University, 2010
    magna cum laude


  • Hon. John R. Padova, Eastern District of Pennsylvania

Fellowships, Leaderships & Recognition

  • Board Member, Ali Forney Center
  • Addison Brown Prize, Harvard Law School
  • Joseph H. Beale Prize, Harvard Law School
  • Symposium Co-Chair and Submissions Editor, International Law Journal
  • Student Attorney, Harvard Law School Criminal Justice Institute
  • Teaching Fellow, Harvard College

Bar and Court Admissions

  • U.S. District Court, Southern District of New York and Eastern District of New York
  • U.S. Court of Appeals for the Second and Third Circuits
  • New York

John Quinn represents businesses and individuals in high-profile civil litigation matters and leads the firm’s efforts in a number of progressive public interest matters. In civil litigation, John represents a wide range of companies from early-stage startups to large tech companies, media companies, and financial institutions. In the past year, John’s civil litigation practice has involved representing Airbnb in obtaining a preliminary injunction to block implementation of a New York City ordinance under the Fourth Amendment, navigating a prominent hotel developer through complex multi-jurisdictional litigation and arbitration proceedings, advising a large hedge fund on multiple matters involving potential litigation, negotiating a complex settlement to multiple disputes involving a renowned art estate, and representing a regional non-profit healthcare company in a post-trial appeal to the U.S. Court of Appeals for the Second Circuit. John also spearheaded the development and filing of a massive RICO case against President Trump and his family and businesses, worked on multiple amicus briefs filed in the United States Supreme Court in cases challenging various executive actions by the Trump administration, and represented a student-led LGBT pride organization in Starkville, Mississippi, in a successful constitutional challenge to the city’s denial of a parade permit—and then flew to Starkville to help lead the parade. John regularly argues in state and federal courts and has extensive experience managing large litigation teams, meeting with government agencies, and advising senior executives of major institutions.  John was selected by Super Lawyers as a 2018 New York Rising Star in Business Litigation and was named one of the Best LGBT Lawyers Under 40 by the National LGBT Bar Association.

John was one of the founders of Kaplan Hecker & Fink in 2017. Prior to the firm’s launch, John spent six years in the litigation group at Sullivan & Cromwell, where he was part of the trial team that successfully represented Microsoft in an eight-week, multi-billion dollar antitrust trial, and then defended the judgment in Microsoft’s favor through appeal to the Tenth Circuit and a petition for a writ of certiorari to the Supreme Court. John also contributed to important civil litigation victories for a large financial institution and an American automobile manufacturer, spent several years representing a hedge fund management company in efforts to investigate and raise concerns about a global multi-level marketing company, represented an international financial institution in a criminal investigation into corruption in international soccer broadcasting, and worked closely with S&C’s Senior Chairman and one of the heads of the firm’s Corporate group in major civil litigation involving claims brought against the Federal Government. 

John is a member of Kaplan Hecker & Fink’s diversity and inclusion committee and is heavily involved in the firm’s recruiting, training, and professional development programs. John is proud to serve as a member of the board of the Ali Forney Center, the largest LGBT youth homeless shelter and community center in the country. John has been active in the mentoring of LGBT associates and law students, traveling to events and panel discussions to talk with law students about navigating the interview process and firm life as an LGBT student and lawyer.  John also has invested substantial time coaching high school mock trial programs. 

John clerked for the Honorable John R. Padova in the United States District Court for the Eastern District of Pennsylvania in his hometown of Philadelphia. He is a magna cum laude graduate of Harvard Law School, where he was awarded the Joseph H. Beale Prize for excellence in Conflict of Laws and the Addison Brown Prize, a prize awarded biannually or annually for an outstanding essay relating to private international law or maritime law. During law school, John served as a Teaching Fellow at Harvard College for a course on constitutional law, assisted Iraqi refugees in need or priority resettlement, collaborated in the development of violence mitigation programs for Sudanese refugee youth in Cairo, and represented clients in criminal proceedings in Roxbury and Dorchester through the Harvard Criminal Justice Institute. John also won a national championship as a member of the Harvard Criminal Justice Institute trial team. John is a trustee of the Aurelian Honor Society at Yale College and an Honorary Overseas Member of the Commercial Bar Association of London.