If you go into the field of medicine, I think any, very active protein like, let’s say interferons have been isolated, thanks to these techniques and then the question was, how should one apply them? In which kind of medical problems? Some, there were some deceptions but there were also discoveries that in certain other fields these products were very useful. Another example which has been widely successful is the product of human insulin which made medicine largely independent of insulins harvested from living animals and I think if one looks at these things these are really very good examples.

I think I’m most proud of the fact that so many of the drugs have really been useful in saving lives. I’ve run into people whose lives have been saved, and the kind of satisfaction that you get from having someone come up and say, “My child had acute leukemia and your drug saved him.” Or, “My little girl had herpes encephalitis, and she is now cured, she is back at school. She is doing very well. People told me that she might be mentally affected, but she is not.” I run into people who have had kidney transplants for 20 years who are still taking the drug. And I don’t think that anything else that happens to you can match that type of satisfaction.

I think I'm trying to be as normal as possible, as authentic as possible, and I always try to stay the same way for as long as possible,

Mr. Rogers lives on. There’s so many legions of people that grew up with him, and they’re still in a way growing up with him. He, of course, was a minister. ... And the children of the show, in the neighborhood, are his ministry. And what a beautiful thing that is. So I, to this day, when someone says, “What are you most proud to have accomplished?” I am so proud to have been a part of that.