James MacArthur was an American actor born on December 8, 1937, in Los Angeles, California. He is best known for his role as Danny Williams on the popular television series Hawaii Five-O, which aired from 1968 to 1980. MacArthur was the son of actress Helen Hayes and playwright Charles MacArthur, which influenced his early interest in acting. Throughout his career, MacArthur appeared in various films and television shows, showcasing his talent in both dramatic and comedic roles. He also had a successful stage career, performing in numerous theater productions. MacArthur continued to act until his retirement in the late 1990s, leaving behind a legacy in the entertainment industry.