[k2enemy]

Almost a thousand pages of presumably well thought out and neatly written notes. For lectures, and not even his own research. I'm always amazed at the productivity and output of the great ones.

[amelius]

Yeah well he didn't get addicted to computer programming so that gave him a lot of extra time to just think.

[aleph_minus_one]

At that time there was less publish or perish and fighting to actually obtain a tenured position. In such a comfortable situation, you can invest more times into preparing good lectures.