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Paul Hastings drops ex-Proskauer COO accused of stealing company secrets

The former Executive of Proskauer Rose has been accused of stealing sensitive business secrets from the law firm, which led him to lose his job at rival Paul Hastings in the wake of Proskauer’s lawsuit against him. Jonathan O’Brien who resigned as Proskauer’s Chief Operating Officer in December has been set to join Paul Hastings according to a person familiar with the matter. The New York-based Proskauer had sued O’Brien in Manhattan Federal Court on 27th December 2022 claiming to pilfer the electronic files relating to Proskauer’s Finances, strategy, practice information, and billing rates before announcing his resignation days earlier.

Finally, a judge granted the firm, its request for a temporary restraining order requiring Jonathan O’Brien to return any proprietary files taken by him from the firm by January 6th, 2022, where he denied all the allegations of stealing trade secrets and other sensitive business records. Proskauer and Paul Hastings are among the 50 largest law firms in the US, where each of them is employing hundreds of attorneys at a gross revenue surpassing $1 Billion in 2021.

Jonathan O’Brien is a British Citizen who is not a lawyer by profession, joined Proskauer in 2015, and served as the chief operating officer over the last five years. His career included previous stints as the global finance director of the Boston Consulting Group and the Chief Financial Officer of Fidelity Worldwide Investment. The case has been registered as Proskauer Rose LLP v. O’Brien., No.- 1:22-cv-10918.




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