Ernest Courant (born 1920) has been called the "father of modern particle accelerators". A fundamental contributor to the field, he has also been mentor to several generations of students. In this kind of generative academic influence, he can be compared to his father,the mathematician Richard Courant.
Currently, Ernest Courant is a member the National Academy of Sciences, and remains active as a distinguished scientist emeritus at Brookhaven National Laboratory. He has played a part in the work of Brookhaven for sixty years.