> ...he had helped make some significant contributions a few years back...
Article says his paper on it was published in 1979, which was 43 years ago. I wouldn't call that 'a few years back'. I interpreted your comment as he took a break from his philanthropy to come up to an efficient solution to the problem like 3-5 years ago.
No problem. It's still cool, still makes him a hacker, just slightly less impressive than if he had done it while juggling the needs of his Foundation.
Article says his paper on it was published in 1979, which was 43 years ago. I wouldn't call that 'a few years back'. I interpreted your comment as he took a break from his philanthropy to come up to an efficient solution to the problem like 3-5 years ago.