Background: Kenneth Lauren Burns (born July 29, 1953) is an American filmmaker, known for his style of using archival footage and photographs in documentary films. His widely known documentary series include The Civil War (1990), Baseball (1994), Jazz (2001), The War (2007), The National Parks: America's Best Idea (2009), Prohibition (2011), The Roosevelts (2014), and The Vietnam War (2017). He was also executive producer of both The West (1996, directed by Stephen Ives), and Cancer: The Emperor of All Maladies (2015, directed by Barak Goodman).
Context: Burns worked as a cinematographer for the BBC, Italian television, and others, and in 1977, having completed some documentary short films, he began work on adapting David McCullough's book The Great Bridge, about the construction of the Brooklyn Bridge. Developing a signature style of documentary filmmaking in which he "adopted the technique of cutting rapidly from one still picture to another in a fluid, linear fashion [and] then pepped up the visuals with 'first hand' narration gleaned from contemporary writings and recited by top stage and screen actors", he made the feature documentary Brooklyn Bridge (1981), which earned an Academy Award nomination for Best Documentary and ran on PBS in the United States.  Following another documentary, The Shakers: Hands to Work, Hearts to God (1984), Burns was Oscar-nominated again for The Statue of Liberty (1985). Burns frequently collaborates with author and historian Geoffrey Ward, notably on documentaries such as The Civil War, Jazz, Baseball, and the 10 part TV series The Vietnam War (aired September 2017).  Burns has gone on to a long, successful career directing and producing well-received television documentaries and documentary miniseries on subjects as diverse as arts and letters (Thomas Hart Benton, 1988); mass media (Empire of the Air: The Men Who Made Radio, 1991); sports (Baseball, 1994, updated with 10th Inning, 2010); politicians (Thomas Jefferson, 1997); music (Jazz, 2001); literature (Mark Twain, 2001); war (the 15-hour World War II documentary The War, 2007); environmentalism (The National Parks, 2009); and the Civil War (the 11-hour The Civil War, 1990, which All Media Guide says "many consider his 'chef d'oeuvre'").  According to a 2017 piece in the New Yorker, Burns and his company, Florentine Films, have selected topics for documentaries slated for release by 2030. These topics include country music, the Mayo Clinic, Muhammad Ali, Ernest Hemingway, the American Revolution, Lyndon B. Johnson, Barack Obama, Winston Churchill, the American criminal justice system, and African-American history from the Civil War to the Great Migration.
Question: Which was his most successful?. Whats the answer?