Unfortunately, I only ever got to know him through the self-paced CS9 series. I truly wish I had gotten to take 61A with him - and before it switched away from

Unfortunately, I only ever got to know him through the self-paced CS9 series. I truly wish I had gotten to take 61A with him - and before it switched away from Scheme. I don't think the current incarnation is a worthy successor of the SICP based one.