O’Melveny & Myers’ sole resident Singapore partner Nathan Bush has left the firm to join DLA Piper.

Bush joins as the firm’s Singapore-based Asia head of investigations and Asia head of antitrust. A disputes specialist, Bush focuses his practice on investigations and regulatory compliance issues with an emphasis on antitrust law. He joined the firm in 2001 and became a partner in 2009. With a focus on China-related work, Bush was based in the firm’s Beijing office between 2004 and 2012, at which time he started to split his time between the Chinese capital and Singapore.