Work
Feller held a docent position at the University of Kiel beginning in 1928. Because he refused to sign a Nazi oath, he fled the Nazis and went to Copenhagen, Denmark in 1933. He also lectured in Sweden (Stockholm and Lund). As a refugee in Sweden, Feller reported being troubled by increasing fascism at the universities. He reported that the mathematician Torsten Carleman would offer his opinion that Jews and foreigners should be executed.
Finally, in 1939 he arrived in the U.S. where he became a citizen in 1944 and was on the faculty at Brown and Cornell. In 1950 he became a professor at Princeton University.
The works of Feller are contained in 104 papers and two books on a variety of topics such as mathematical analysis, theory of measurement, functional analysis, geometry, and differential equations.
Feller was one of the greatest probabilists of the twentieth century, who is remembered for his championing of probability theory as a branch of mathematical analysis in Sweden and the United States. In the middle of the 20th century, probability theory was popular in France and Russia, while mathematical statistics was more popular in the United Kingdom and the United States, according to the Swedish statistician, Harald Cramér. His two-volume textbook on probability theory and its applications was called "the most successful treatise on probability ever written" by Gian-Carlo Rota. By stimulating his colleagues and students in Sweden and then in the United States, Feller helped establish research groups studying the analytic theory of probability. In his research, Feller contributed to the study of the relationship between Markov chains and differential equations, where his theory of generators of one-parameter semigroups of stochastic processes gave rise to the theory of "Feller operators".
Read more about this topic: William Feller
Famous quotes containing the word work:
“Honorable Senators: My sincerest thanks I offer you. Conserve the firm foundations of our institutions. Do your work with the spirit of a soldier in the public service. Be loyal to the Commonwealth and to yourselves and be brief; above all be brief.”
—Calvin Coolidge (1872–1933)
“It is the work of a brave man surely, in whom there was no guile! He rounded this water with his hand, deepened and clarified it in his thought, and in his will bequeathed it to Concord. I see by its face that it is visited by the same reflection; and I can almost say, Walden, is it you?”
—Henry David Thoreau (1817–1862)
“You haf slafed your life away in de bosses’ mills and your fadhers before you and your kids after you yet. Vat is a man to do with seventeen-fifty a week? His wife must work nights to make another ten, must vork nights and cook and wash in day an’ vatfor? So that the bosses can get rich an’ the stockholders and bondholders. It is too much... ve stood it before because ve vere not organized. Now we have union... We must all stand together for union.”
—John Dos Passos (1896–1970)