Each year, ACM's most prestigious technical award, the Turing Award, is given to an individual selected for lasting and major contributions of a technical nature made to the computing community.

In 1983, Ken Thompson received the ACM Turing Award. This was his lecture.

I am a programmer. On my 1040 form, that is what I put down as my occupation. As a programmer, I write programs. I would like to present to you the cutest program I ever wrote. I will do this in three stages and try to bring it together at the end.

...

The moral is obvious. You can't trust code that you did not totally create yourself.

ACM Classic: Reflections on Trusting Trust