Cadwalader, Wickersham & Taft antitrust partner Amy Ray—part of the team involved in securing regulatory approval for several recent high-profile Microsoft Corp. acquisitions—has left the firm to join Orrick, Herrington & Sutcliffe.

Washington, D.C.-based Ray, who had been at Cadwalader for over 10 years, played a role in Microsoft’s $26.2 billion acquisition of LinkedIn, its $7.2 billion acquisition of Nokia’s devices and services business, and its $8.5 billion acquisition of Skype.