Former King & Wood Mallesons global litigation head Beau Deleuil will join the U.S. firm in April.
The Australian firm has brought aboard a 13-lawyer practice group from rival Herbert Geer.
Kevin Hawkins is joining local firm Vilaf in Ho Chi Minh City.
Peter McDonald was previously a partner at Herbert Smith Freehills.
Rebekah Gay was previously a partner at Sydney boutique firm Shelston IP.
The firm has hired Winston & Strawn Beijing managing partner Jem Li and Gide Loyrette Nouel Hong Kong partner Rebecca Silli. They start next month and in January, respectively.
The shifting market, a series of departures and leadership changes—in the U.S. as well as Asia—have raised questions about the firm's Asia strategy. But chairman Bradley Butwin insists that O'Melveny's commitment to Asia is as strong as it ever was.