Ben Bova (1932-2020) was an editor, science writer, and six-time Hugo Award-winning author of more than 100 books including City of Darkness, Mars, The Story of Light, and Tales of the Grand Tour. Harlan Ellison (1934-2018) was a multiple Hugo-award winning author of short stories, novels, and screenplays. His work included A Boy and His Dog and scripts for such series as Star Trek and The Twilight Zone. He also performed as a narrator, and his credits included 20,000 Leagues under the Sea, City of Darkness, The Greatest Mysteries of All Time Volume 2, and Thief of Time.