• Born date: 1910-10-29
  • Born in: n.a.
  • Death date: 1989-06-27
A. J. Ayer

Sir Alfred Jules "Freddie" Ayer (/ɛər/; 29 October 1910 – 27 June 1989) was a British philosopher known for his promotion of logical positivism, particularly in his books Language, Truth, and Logic (1936) and The Problem of Knowledge (1956).Ayer was a Special Operations Executive and MI6 agent during the Second World War.