An acclaimed American screenwriter and director, he is best known for his work on the "Bourne" series and for writing and directing "Michael Clayton," which earned him Academy Award nominations. Born in Manhattan in 1956, he is the son of playwright Frank D. Gilroy. He began his career as a screenwriter in the 1990s, contributing to films like "The Devil's Advocate" and "Armageddon." His directorial debut, "Michael Clayton," was released in 2007, establishing him as a prominent filmmaker.