Robert Heinlein
Arthur C. Clarke
Isaac Asimov (SF mostly/only)
John Scalzi
Jack McDevitt
C. S. Lewis
JRR Tolkien
Madeline L'Engle
Donald Keith
Bertrand R. Brinley
Perhaps I've missed a book or story here or there, but few... and I'm probably overlooking an author or two that slip my mind at the moment...😜😆