Leonard Shlain (1937-2009) was a surgeon, author, and inventor. He was the author of Art & Physics: Parallel Visions in Space, Time, and Light; Sex, Time, and Power: How Women's Sexuality Shaped Human Evolution; and Leonardo's Brain: Understanding Da Vinci's Creative Genius.
Norman Dietz is a writer, an actor, and a solo performer. He has also performed frequently on radio and television, and he has recorded over 150 audiobooks, many of which have earned him awards from AudioFile magazine, the ALA, and Publishers Weekly. Additionally, AudioFile named Norman one of the Best Voices of the Century.