John Gregory Butler

WilmerHale (Washington)
Lawyer (Associate)

John Gregory Butler is a senior associate in the Regulatory and Government Affairs Department and a member of the Antitrust and Competition Practice Group. He joined the firm in 2011. Prior to joining the firm, Mr. Butler served as a law clerk to the Hon. Cecilia M. Altonaga of the of the United States District Court for the Southern District of Florida. Prior to his time as a clerk, he was a consulting attorney for the United Nations Joint Human Rights Office in Kinshasa, Democratic Republic of Congo. While pursuing his legal education, Mr. Butler held a judicial internships with the Hon. Edward Damich of the United States Court of Federal Claims and the Hon. Debra Livingston of the United States Court of Appeals for the Second Circuit. Before law school, he taught the English language and American culture to students in Shenzhen, China.

Linked authors

Sheppard Mullin (New York)
US Federal Trade Commission (FTC) (Washington DC)
Milbank, Tweed, Hadley & McCloy (New York)
Weil, Gotshal & Manges (New York)
Vinson & Elkins (Dallas)
Drinker Biddle & Reath (Washington)
US Department of Justice (Washington)


266 Bulletin

Craig Zieminski, Eric S. O’Connor, John Gregory Butler, Katherine Ambrogi, Lee Roach, Matthew R. Maddox, Neeraj K. Gupta, Wendy Fu The US FTC requires divestiture of production and intellectual property assets before clearing an acquisition in the market for desktop hard drives (Western Digital / Hitachi GST)


On May 8, 2012, Western Digital Corporation (“Western Digital”) completed its acquisition of Viviti Technologies (formerly, Hitachi Global Storage Technologies Ltd., or, “Hitachi GST”) for approximately $4.8 billion, after the Federal Trade Commission (“FTC”) approved a consent order requiring (...)

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