I'm not sure for overseas, but in the UK he is by far well known for his contribution towards cracking German transmissions and helping towards ending the war.

I'm not sure for overseas, but in the UK he is by far well known for his contribution towards cracking German transmissions and helping towards ending the war. The Turing Machine is something else he is known for (as an aside for his contributions during WW2) but I suspect if you were to ask the average person, they'd suggestion foremostly he cracked German transmissions not built the precursor to the computer. Perhaps more recently he will have been known to be gay and had committed suicide, because in recent years there has been a lot more about him in the media. I've got to confess I didn't know much about his later life and suicide for a long time and only really knew of him in regards to WW2 and his part played in computing history.