I used to watch him on late night TV
Today is Tom Lehrer's birthday! What a coincidence!
Somewhere in the back of my mind I knew that today would be a great day to listen to him again.
Tom Lehrer is very talented indeed. He is also very good at mathematics.
Are you referring to his "New Math"?
No, actually he taught people how to do math. He was a lecturer. 
Have you ever heard his song "New Math" where he lampoons the entire concept? I used to see him with Jack Parr in the good old days. 
Yes, actually he was a PhD student at Harvard University. He is crazily smart!
I never knew him at Harvard, I hear it is a pretty good school, but a lot of fraternity shenanigans go on there, especially way-back-when.
yes, he earned his math degree at 19, it is crazy. He is very confident and talks straight. 
I saw where he turned 93 today, that's quite an accomplishment. I hope he lives as long as Prince Phillip did.