Carl Edward Sagan (1934-1997) was an astronomer and science popularizer.
In a March 1996 profile by Jim Dawson in the Minneapolis Star-Tribune, Sagan talked about his then-new book The Demon Haunted World and was asked about his personal spiritual views: "My view is that if there is no evidence for it, then forget about it," he said. "An agnostic is somebody who doesn't believe in something until there is evidence for it, so I'm agnostic."
Update from Tom Head, editor of Conversations with Carl Sagan (University Press of Mississippi, 2006):
Sagan resisted the atheism label and self-described as an agnostic.
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