Peter Lerman is a narrator from the heart of New York City: Brooklyn born and raised. He has appeared onstage as Horace Vandergelder in Hello Dolly, Bobby Gould in Speed-the-Plow, the Governor of Texas in Best Little Whorehouse..., Jonathan Brewster in Arsenic and Old Lace, and Lenny in Rumors.
William Sheehan is a retired psychiatrist, amateur astronomer, and astronomical historian who has written twenty books on astronomy. His recent books include Discovering Mars (with Jim Bell) and Venus (with Sanjay Limaye).
Klaus Brasch is a retired academic and life-long amateur astronomer. He has published more than one hundred biomedical research papers as well as numerous popular science articles dealing with astronomy and astrobiology.