He's been an invaluable resource for us at the VirtualAGC project [1]. He provided over half (!) of the AGC programs we've made available, including LM software for Apollo 5, 9, 10, 11, 12, 13, and 15-17, plus several other ground development programs. He also was the source of a majority of the schematics that we used in the AGC restoration [2] -- I can say with 100% confidence that it wouldn't have been possible to get that computer working again without his help.
He's got a book out now, Sunburst and Luminary [3], that is very good and goes into a lot of technical detail on the LM software, without getting too much into the weeds. I highly recommend it if you're interested in that sort of thing!
[1] http://www.ibiblio.org/apollo/
[2] https://www.youtube.com/watch?v=2KSahAoOLdU&list=PL-_93BVApb...