A prominent Hong Kong filmmaker, he gained fame for co-directing the acclaimed "Infernal Affairs" trilogy, a cornerstone of modern Asian cinema. Starting as a cinematographer, he worked on action-packed films, developing a signature visual style. Transitioning to directing in the 1990s, he crafted a series of successful action and crime dramas. His works often explore themes of loyalty and identity. He has expanded his influence internationally, contributing to both Asian and Western film industries.