John C. Oxtoby (1910-1991) made important contributions to measure theory and ergodic theory and is probably best known for the Oxtoby – Ulam theorem that proved the prevalence of ergodic homoemorphisms on the unit cube. He was Class of 1897 Professor of Mathematics at Bryn Mawr College, where he chaired the department for 28 years and taught from 1939-1979. His book “Measure and Category" (Springer-Verlag, 1971) was widely translated for use by scholars and graduate students. In 1978 he received the Lindback Award for Distinguished Teaching from the Lindback Foundation. He was born in Saginaw, Michigan, graduated from the University of California at Berkeley and was Junior Fellow of the Harvard University Society of Fellows. He served as editor of the Bulletin of the American Mathematical Society and was a Hedrick Lecturer of the Mathematical Association of America.