Mergers and acquisitions partner Keith Hallam, after almost two decades at Cravath, Swaine & Moore, has moved to White & Case in New York, the firm said Monday.

Hallam is a known commodity in the M&A world, after making partner at Cravath in 2015. His most recent big deals include advising Aon in acquiring NFP Corp. for about $13.4 billion and advising Atlas Air Worldwide in its $5.2 billion acquisition by an investor group led by Apollo.