Freeman Dyson,在一次訪談中，對Ph.D 制度的看法：
Q:without ever having received a Ph.D. You seem almost proud of that fact.
Tyson: Oh, yes. I’m very proud of not having a Ph.D. I think the Ph.D. system is an abomination. It was invented as a system for educating German professors in the 19th century, and it works well under those conditions. It’s good for a very small number of people who are going to spend their lives being professors. But it has become now a kind of union card that you ha⋯⋯