? A.J. Monaco | O'Brien LLP | New York

A.J. Monaco

  Location: New York, New York
  Phone: 212-729-7858 |  Fax: 646-205-3071
  Email: Ajmonaco@obrienllp.com

Mr. Monaco has more than ten years of experience representing clients in complex commercial matters. He joined O’Brien LLP in October 2011, where he has represented cutting edge technology companies, investment and commercial banks, private equity funds and hedge funds, as well as individuals in commercial disputes in state and federal courts around the country. Mr. Monaco has extensive experience defending breach of contract actions and other business torts and in all phases of litigation, from client counseling through trial and appeal, as well as in arbitration.

Prior to that, Mr. Monaco worked at Sullivan & Cromwell, LLP, where he worked on a wide variety of commercial disputes, and helped corporations and financial institutions respond to governmental investigations. Prior to that, Mr. Monaco was with Sullivan & Graber in New Jersey, where he represented insurance companies litigating large-scale insurance fraud cases.

Representations in which Mr. Monaco has participated include:

  • Represented a private equity firm and its principal against a former executive employee alleging breaches of contract and fiduciary duty, obtaining complete dismissal of all claims.
  • Represented managing member of a quantitative investment firm in arbitration seeking to dissolve the partnership, resulting in the resulting in the client retaining the exclusive rights to use the partnership’s intellectual property.
  • Represented a multi-billion dollar hedge fund in an arbitration brought against a former employee for breach of a separation agreement, obtaining an award of over $900,000 in damages.
  • Represented a hedge fund manager and worked on the trial team as co-lead counsel in a jury trial in Alabama, defending against breach of contract claims and pursuing claims of fraud and breach of fiduciary duty against a well-known public REIT. Obtained a verdict of $12.7 million, including punitive damages, and dismissal of all claims asserted against the client.
  • Represented a prominent manufacturing company in obtaining approval of a merger with a rival company after an SEC investigation.

Bar Admission

  • New York
  • New Jersey
  • U.S. District Court Southern District of New Jersey
  • US. District Court Southern District of New York, 2014
  • U.S. District Court Eastern District of New York, 2014
  • California


  • UCLA School of Law, Los Angeles, California
    •   J.D. - 2004
  • Dartmouth College
    •   B.A. - 1998

Published Works

  • “Defend Trade Secrets Act Provides Hedge Fund Managers With Protections for Proprietary Trading Technology and Other Trade Secrets,” The Hedge Fund Law Report, Vol. 9, No. 25 (June 23, 2016), by Sean R. O’Brien and A.J. Monaco.

    How Can Hedge Fund Managers Protect Themselves Against Trade Secret Claims?,” The Hedge Fund Law Report, Vol. 7, No. 19 (May 16, 2014), by Sean R. O’Brien, Sara A Welch and A.J. Monaco.

Practice Areas