A decent oral history (the Computer History Museum did a lot of them, a pity they seem to have died with Paul Allen). Doesn't seem to have been followed up as the ending promises, so it winds up omitting almost all of his academic & physics-related life, which is a pity. See https://gwern.net/doc/cs/2016-hagar.pdf for more.
Highlights: he blew stuff up as a kid; discovering social engineering as a kid of the look-like-you-belong-and-they'll-just-let-you-in sort; flew Piper Cubs so high saliva boiled and ran zero-g experiments for fun, using a floating eraser head to check he had true zero-g; Air Force radar pranks and the general idiocy of the military; getting into computing through SAGE; inventing drum memory and helping with time-sharing OSes; hyperoptimizing his tools like an assembler which could run in '1 pass' while using near-zero memory because you finished the program by running it through the card punch backwards; and taking credit for killing IBM's Future Systems https://en.wikipedia.org/wiki/IBM_Future_Systems_projectand Russia's Rayvka.
Highlights: he blew stuff up as a kid; discovering social engineering as a kid of the look-like-you-belong-and-they'll-just-let-you-in sort; flew Piper Cubs so high saliva boiled and ran zero-g experiments for fun, using a floating eraser head to check he had true zero-g; Air Force radar pranks and the general idiocy of the military; getting into computing through SAGE; inventing drum memory and helping with time-sharing OSes; hyperoptimizing his tools like an assembler which could run in '1 pass' while using near-zero memory because you finished the program by running it through the card punch backwards; and taking credit for killing IBM's Future Systems https://en.wikipedia.org/wiki/IBM_Future_Systems_project and Russia's Rayvka.