FreeThoughtAction recognizes atheist Benedetto Croce (February 25, 1866 - November 20, 1952) on his birthday.
According to Wikipedia, Croce "was an Italian critic, idealist philosopher, and politician. He wrote on numerous topics, including philosophy of history and aesthetics."
We also note the anniversary of the death of atheist Claude Elwood Shannon (April 30, 1916 - February 24, 2001).
According to Wikipedia, Shannon was "an American electrical engineer and mathematician, has been called 'the father of information theory,' and was the founder of practical digital circuit design theory.