A physics undergraduate at U Texas, Mood obtained his statistics PhD (supervised by Wilks) at Princeton U in 1940. He spent the Second World War at the National Defense Research Council, joining the faculty at ISU in 1945. His varied career included appointments at U Texas, Princeton U, Brown U, and U California at Irvine, as well as periods working for government organizations. He was co-author with Graybill of the 1963 textbook Introduction to the Theory of Statistics, which for many years was the recommended introductory textbook worldwide. He was President of the IMS in 1957 and of the Operational Research Society of America in 1963. He was the ASA Wilks Award winner in 1979.

http://www.lib.iastate.edu/arch/rgrp/13-24-58.html Fuller biography.