Mr. Gesser is a litigation partner and a core member of our Data Strategy & Security practice. Having joined Debevoise in January 2020, Mr. Gesser brings to the firm extensive experience advising major companies on a wide range of data, cybersecurity and incident response matters, including artificial intelligence and data minimization. He has represented international financial services firms, private equity firms, hedge funds and media organizations throughout full cybersecurity incident cycles, including managing large-scale data breaches, coordinating with law enforcement, responding to regulatory investigations, advising boards and executives on critical data liability issues, and defending against civil lawsuits. Mr. Gesser is a primary author of the firm’s Data Blog and the architect of the Firm’s Data Portal, an online tool that helps clients quickly assess and comply with their cyber breach notification obligations.

Mr. Gesser also represents companies and financial institutions in investigations relating to anti-money laundering, sanctions and FCPA compliance. He has advised several U.S. and international financial institutions on cross-border tax investigations conducted by the U.S. Department of Justice, the Securities and Exchange Commission and the New York Department of Financial Services and on the subsequent enhancement of their compliance policies.

Mr. Gesser has been recognized for his outstanding work throughout his career by legal directories and trade publications, and in 2013, he was the recipient of both the Attorney General’s Exceptional Service Award and the FBI Director’s Award for Excellence – Outstanding Criminal Investigation. From 2010 to 2012, Mr. Gesser served as Counsel to the Chief of the Fraud Section, Criminal Division at the Department of Justice.

He received his B.S. from the University of Manitoba in 1991, his LL.B. from the University of Manitoba in 1994, his LL.M. from the University of Cambridge in 1995 and his LL.M. from New York University in 1998, where he served as the graduate editor of the Journal of International Law and Politics.


  • New York University School of Law, 1998, LL.M.
  • University of Cambridge, 1995, LL.M.
  • University of Manitoba, Faculty of Law, 1994, LL.B.
  • University of Manitoba, 1991, B.Sc.

Bar Admissions

  • New York