Ken Burns

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Ken Burns, from left, Trent Reznor, Atticus Ross and Lynn Novick speak at PBS' "The Vietnam War" panel at the 2017 Television Critics Association press tour on Sunday, Jan. 15, 2017, in Pasadena, Calif. (Photo by Willy Sanjuan/Invision/AP)

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Ken Burns, from left, Trent Reznor, Atticus Ross and Lynn Novick speak at PBS' "The Vietnam War" panel at the 2017 Television Critics Association press tour on Sunday, Jan. 15, 2017, in Pasadena, Calif. (Photo by Willy Sanjuan/Invision/AP)

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Rachel Robinson, left, and filmmaker Ken Burns participate in the "Jackie Robinson" panel at the PBS Winter TCA on Monday, Jan.18, 2016, in Pasadena, Calif. (Photo by Richard Shotwell/Invision/AP)

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Executive producer Ken Burns attends a preview screening of "Cancer: The Emperor of All Maladies," at the Time Warner Center, in New York in this Tuesday, March 24, 2015, file photo. (Photo by Evan Agostini/Invision/AP, File)

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Filmmaker Ken Burns looks at a book of Civil War draft records during a news conference at the National Archives in Washington, Wednesday, April 6, 2011, in conjunction with Ancestry.com, making newly digitized Civil War records available online. (AP Photo/Jacquelyn Martin)

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Documentary filmmaker Ken Burns told an audience at the National Archives in Washington on Wednesday, April 6, 2011, that he, too, found a family connection in the archives for the Civil War. It turns out his great-great-grandfather Abraham Burns was a member of the horse artillery. In celebration of the 150th anniversary of the start of the Civil War, the National Archives and Ancestry.com announced Wednesday that Civil War archives now will be available online outside the archives. (Barbara L. Salisbury/The Washington Times)

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Documentary filmmaker Ken Burns (right) and TV journalist and author Cheryl Wills look at a book that contains Civil War draft registration records at the National Archives in Washington on Wednesday, April 6, 2011, following the announcement that Civil War records such as these will now be available online at Ancestry.com. (Barbara L. Salisbury/The Washington Times)

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Documentary filmmaker Ken Burns (right) talks with TV journalist and author Cheryl Wills following an announcement on Wednesday, April 6, 2011, at the National Archives in Washington that Civil War documents will now be available online outside the archives. The document seen here lists draft registrations for the war. (Barbara L. Salisbury/The Washington Times)

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Documentary filmmaker Ken Burns told audience members at the National Archives in Washington on Wednesday, April 6, 2011, that he, too, found a family connection in the archives for the Civil War. It turns out his great-great-grandfather Abraham Burns was a member of the horse artillery. In celebration of the 150th anniversary of the start of the Civil War, the National Archives and Ancestry.com announced Wednesday that war archives now will be available online outside the archives. (Barbara L. Salisbury/The Washington Times)

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FILE - In this March 25, 2011 file photo, documentary filmmaker Ken Burns speaks to reporters during a news conference at the National Constitution Center in Philadelphia. (AP Photo/Matt Rourke, file)