A nano nit: Yes, GC came from Lisp, but its first mention was in AI Memo #1 (the first MIT AI Lab working paper) by Minsky. I have a copy someplace -- it was only a few pages long.
http://www.softwarepreservation.org/projects/LISP/MIT/AIM-00...
http://publications.csail.mit.edu/ai/browse/0000browse.shtml
(It is not there)
But thanks to the miracle of modern science, it's online here: ftp://publications.ai.mit.edu/ai-publications/pdf/AIM-058.pdf
#1 was JMC's memo on Lisp, but (tying back to this thread) you had to manage memory with CONS (malloc()) and erase (free()).
(I note the date was around the time the first PDP-6 was delivered to the AI Lab so the memo was probably timely. Boy, the PFP-10 (basically the 'real version' of the PDP-6) was such a pleasure to write for, with an instruction set that was basically lisp primitives.)