Daniel P. Weick

Daniel P. Weick

  • Of Counsel
  • New York


Dan is Of Counsel in Hausfeld’s New York office with experience representing clients in all phases of federal antitrust litigation from case inception through trial, appeal, and judgment enforcement proceedings. Dan has also represented complainants and third-parties in numerous government antitrust investigations concerning collusion, unilateral conduct, and potentially anticompetitive mergers.

Dan’s practice has focused on antitrust matters in the technology and life sciences industries. In the technology space, he has advised companies regarding complaints about mobile app payment and distribution restrictions, supervised government investigations in social networking and other tech markets, and litigated issues of platform access, abuse of software IP, and deception of standards setting organizations, among many other questions. He has likewise represented plaintiffs in litigation challenging practices that restrain generic pharmaceutical entry such as product hopping, abuse of restricted distribution agreements, and deception of regulatory authorities.

Immediately prior to joining Hausfeld, Dan served as Special Litigation Counsel in the New York State Office of the Attorney General's Antitrust Bureau where his responsibilities included providing leadership for multi-state antitrust investigations, as well as formulating and executing on antitrust litigation strategy. Prior to his government service, he worked for over a decade in private practice, where he represented clients in litigation matters before federal district and circuit courts around the country and before the U.S. Supreme Court, as well as in investigations by the U.S. Department of Justice Antitrust Division, the Federal Trade Commission, state attorneys general, the European Commission, and multiple other international enforcers.

In addition to his legal training and practice experience, Dan completed an MPA in Economic Policy Management program at Columbia University's School of International and Public Affairs (SIPA) in 2021, where he developed quantitative policy and economic analysis skills that allow him to effectively bridge the gap between the legal and economics teams in developing the economic and statistical evidence essential to modern antitrust litigation. He also serves as a member of the Editorial Board of the Antitrust Law Journal, where he participates in the peer-review and editing of new scholarship on cutting-edge antitrust issues.

Working towards a diverse, equitable, and inclusive world is paramount to Dan who is an active member of our LGBTQ+ Alliance working group.


Dan represents clients seeking recoveries for antitrust and consumer protection violations in complex civil litigations.