Which famous film director is known for his work in both independent documentaries and features?

Ken Burns is renowned for his distinctive approach to filmmaking, particularly in the realm of documentaries. He has created numerous influential documentary films that often focus on American history and culture, utilizing a style characterized by narrative storytelling, archival footage, and interviews. His work includes landmark series such as "The Civil War," "Baseball," and "The Vietnam War," which have not only garnered critical acclaim but have also shaped public understanding and appreciation of historical events.

Burns’ ability to merge artistic vision with educational content exemplifies the impact of independent documentaries on mainstream media, highlighting how independent filmmakers can influence public discourse with thought-provoking material. This focus on history and storytelling distinguishes him from more traditional narrative filmmakers, which is why he is the correct answer in this context.

The other filmmakers listed, while also iconic in their own rights, are primarily known for their contributions to narrative cinema rather than the documentary genre. Martin Scorsese and Francis Ford Coppola are celebrated for their significant works in classic and influential films within the Hollywood system, while Alfred Hitchcock is revered as the master of suspense in fiction films. Thus, Ken Burns stands out as the figure specifically associated with both independent documentary filmmaking and feature projects.