An acclaimed American documentary filmmaker, he is known for his compelling storytelling and keen visual style. His work often explores complex social and political issues, earning him numerous awards including an Emmy and a Peabody. He has directed and produced films such as "The Day After Trinity" and "Sing Faster: The Stagehands' Ring Cycle." A former cinematographer, he also taught at the University of California, Berkeley, influencing a new generation of filmmakers.