An influential American film director, producer, and writer, he emerged as a prominent figure in the New Hollywood era of the 1970s. He co-created the television series "The Monkees" and gained acclaim for directing films like "Five Easy Pieces" and "The King of Marvin Gardens," both starring Jack Nicholson. Known for his unconventional storytelling and character-driven narratives, he was instrumental in shaping modern American cinema. His career spanned several decades, leaving a lasting impact on the industry.