
Intellectual Property
Antitrust
Bankruptcy
Licensing
Mergers and Acquisitions
Trademark Strategy
Eugene L. Chang is a partner at Willkie Farr & Gallagher in New York City, specializing in intellectual property, antitrust, and bankruptcy law. With a focus on transactional practice within the IP department, he advises clients on licensing, outsourcing, and complex transactions, including mergers and acquisitions and bankruptcy-related acquisitions. Eugene also litigates intellectual property issues across various technology sectors, such as software, pharmaceuticals, and medical devices. Recognized as a leading technology practitioner by Chambers USA, he has been acknowledged as a NY Super Lawyer for over a decade. Eugene's expertise extends to global trademark strategy, making him a sought-after advisor in the legal community.

- ITE Management L.P. acquired the target/assets from Milestone Equipment Holdings in an acquisition. - Deal value was 4700000000 Sector: Transportation; Location: USA. - On the acquirer side, legal representation details are not available, but involved lawyers include Dvir Oren, Eugene Chang, Madison Willes-Hafner, and Brien.
Dec 15 2025
5B
Private Equity

Partner
2003 – Unknown

Associate
1999 – 2003

Associate
1995 – 1999

- Bending Spoons acquired the target/assets from Yahoo in a acquisition on not available. - Deal value was 1900000000 Sector: Technology; Location: Global. - On the acquirer side, not available advised, led by Anna Martini G. Pereira, Daniel Alvarez, Daniel Lopez, Eugene Chang, Mark Cognetti.
Oct 30 2025
2B
M&A
On November 17, Willkie’s Tech Patent Litigation group secured a significant win for Body Fit Training, a subsidiary of Xponential Fitness, Inc., in a high-profile, high-stakes, competitor vs. competitor patent litigation brought by F45 Training, a publicly traded Australia-based fitness franchisor. The lawsuit marks the latest chapter in F45’s now-failed worldwide legal campaign against Body Fit, in which F45 filed and lost a similar patent infringement case in Australia, and filed various unsuccessful trademark-related cases in several countries. Significantly, Body Fit and Xponential have now managed to invalidate several of F45’s key patents on a global scale. F45 had accused Body Fit Training of infringing F45’s U.S. Patent No. 10,143,890 (“the ’890 patent”), which was drawn to methods of configuring fitness studios based on information sent from a central server. F45 claimed that this invention enabled its rapid growth and commercial success, and it sought an injunction against Body Fit Training as part of its requested relief. F45 brought the case in Delaware federal district court, with Circuit Judge William C. Bryson, of the U.S. Court of Appeals for the Federal Circuit, presiding by designation. The Court granted Body Fit Training’s motion for summary judgment, finding that all asserted claims of the ’890 patent were invalid. As Judge Bryson found, Body Fit Training demonstrated that the ’890 patent was invalid under 35 U.S.C. § 101 for claiming patent-ineligible subject matter, because its claims were directed to generic and abstract concepts, and recited only well-understood, routine, and conventional activities well-known in the fitness and computing industries. Judge Bryson also found for Body Fit Training and granted partial summary judgment of non-infringement on several of F45’s claims. The Court then entered final judgment in favor of Body Fit Training. The Willkie team included partners Indranil “Indy” Mukerji, Stephen Marshall and Eugene Chang, and associates Devon Edwards, Gabrielle Antonello, Derek Biehn and Chris Hong.
Nov 23

1 min
LL.M., Temple University Beasley School of Law
2006
J.D., University of Virginia School of Law
1995
B.S., Yale University
1990