Peter Thomas is Managing Partner of Simpson Thacher's Washington, D.C. office and a member of the Firm's Litigation Department. Mr. Thomas has extensive experience in large, complex commercial litigations and arbitrations, concentrating in the areas of antitrust, international arbitration, contract and fraud disputes. He also advises clients in transactions potentially subject to review by the Committee on Foreign Investment in the United States (CFIUS). The Firm’s Washington, D.C. office concentrates primarily on antitrust litigation and merger enforcement, international investment treaty and commercial arbitration, governmental and internal investigations, including securities enforcement matters, and other regulatory matters.

Mr. Thomas’s recent experience has included: representing DoubleClick in successfully obtaining FTC clearance of its acquisition by Google following a Second Request investigation; the Aluminum Corporation of China (Chinalco) in connection with CFIUS matters arising from its minority non-controlling investment in Rio Tinto; the Dominican Republic in international investment treaty arbitrations stemming from privatization of the country’s electricity sector; The Blackstone Group, L.P. in putative class action antitrust litigation brought against private equity firms and investment banks alleging collusive bidding practices; Warner Chilcott in antitrust enforcement and private civil litigation in the D.C. District Court; MasterCard International through trial and related proceedings on its successful motion to enforce the final judgment against Visa U.S.A. in a Department of Justice antitrust enforcement action; Rinker Group Limited in an antitrust investigation arising from a takeover offer by a competing firm, Cemex, in the ready-mix concrete, cement and aggregates businesses; Oil Basins Limited in an oil and gas arbitration in Melbourne, Australia under a royalty agreement governed by New York law; New Brunswick Power in international litigation proceedings against the Venezuelan state-owned petroleum company and a subsidiary; Accenture in various commercial disputes, litigations and arbitrations, as well as through trial and a successful final award against the Andersen Worldwide network of member firms in the largest multi-party arbitration ever conducted under the ICC Rules.