Fellow Unb3lievers,
I don’t know if my favorite would be considered prominent, but he did precede The Four Horsemen. My favorite Atheist scholar and philosopher was the one whose work firmly convinced me of both the Negative Atheist position and the Positive Atheist position and did so with the tightest, most systematic logical argument. He closed the book on any possibility of me believing in a God ever:
George H. Smith, author of Atheism: The Case Against God.
Of The Four Horsemen, The Hitch and Sam Harris are the popularizers, and Richard Dawkins and Daniel Dennett are the more academic, but all are great and I highly respect their arguments on God and Religion.
As for Atheist celebrities, there are many favorites. In addition to Penn and Teller, James “The Amazing” Randi and Harry Houdini were great magicisns and Unbelievers. Tom Leykis is a breath of rational fresh air on AM talk radio who has an “Ask the Atheist” feature on his show, and just as well he is a funny and hard-nosed realist on relationships. Dr. Dean Edell was a great voice on the radio for scientific medicine and against pseudoscientific quackery before he retired.
There are a whole slew of both prominent and neglected hilarious Atheist humorists and comedians, not just George Carlin and Bill Hicks, but W.C. Fields, Rodney Dangerfield, Benny Hill, Dave Allen, Julia Sweeney, Chris Rock, Steven Fry, Ricky Gervais, Eddie Griffith, Bill Burr, Jim Jeffries, Katt Williams, Adam Corolla, Joe Rogan, Sarah Silverman, Larry David, and a proverbial Cast of Thousands!
Bruce Wayne/Batman and Walter Kovacs/Rorschach of the DC Comics Universe are both Atheists as are Tony Stark/Iron Man, Bruce Banner/Hulk, and Peter Parker/Spider-Man in the Marvel Comic Universe.
The only Atheists I flat-out despise are those of the Totalitarian mindset who want to make a Party, a Class, a “Race” into their proxy for God. This would include Richard Spencer, Tom Metzger, The Late George Lincoln Rockwell and all of the racist Alt-Right and all the Socialist/Communist followers of Marx, Engels, Lenin, Stalin, Mao, Pol Pot, Castro, Chavez, and Maduro.
Atheists and Unbelievers in general figure highly in academia, science, and culture and are, for the most part, good forbidden apples. I love learning more about them daily with my new 2021 Freedom From Religion Foundation Calendar.