12 Resources share the relationship narrator to David, Keith

Rise of the mammals, a Nova production by HHMI Tangled Bank Studios for WGBH Boston ; executive producer, Geoff Luck ; written and directed by Geoff Luck
August Wilson, the ground on which I stand, director, producer, Sam Pollard ; writer, Stephen Stept ; a production of WQED Multimedia and Thirteen Productions LLC's American Masters for WNET
Share My Life
A Swim in a Pond in the Rain
Jackie Robinson, a Florentine Films production ; produced in association with Major League Baseball, WETA, Washington, D.C. ; directed by Ken Burns, Sarah Burns, David McMahon ; written by David McMahon & Sarah Burns ; produced by Sarah Burns, David McMahon, Ken Burns
A Story of God and All of Us
Martin Luther King, Jr.: The Essential Box Set
A Knock at Midnight
Across That Bridge
Horatio's drive, America's first road trip, a Florentine Films production, produced in association with WETA Washington, D.C., the American Lives II Film Project, Inc. ; a film by Ken Burns ; producers, Dayton Duncan, Ken Burns ; writer, Dayton Duncan ; director, Ken Burns
Pop Goes the Weasel
The violence paradox, a Nova production by Little Bay Pictures, LLC for WGBH Boston ; written, produced and directed by Michael Bicks & Anna Lee Strachan