Erwin Schrodinger

His time of active service was not wasted as far as research was concerned, however, for he continued his theoretical work, submitting another paper from his position on the Italian front.

— MacTutor History of Mathematics

2007.05.06 CHK2

Alfred Tarski

Along with Aristotle, Gottlob Frege, and Kurt Godel, Tarski is generally considered one of the four greatest logicians of all time (Vaught 1986). Of these four, he was the best mathematician and the most prolific author.

Hence between 1923 and his departure for the United States in 1939, Tarski not only wrote several textbooks and many papers, a number of them ground-breaking, but did so while supporting himself primarily by teaching high-school mathematics.

— Wikipedia

2007.05.04  CHK2