after world war ii and "methods of operations research", kimball returned to columbia and resumed his research and teaching in theoretical chemistry. he did however continue to be involved in or activities, including civilian or applications in industry and the public sector. he continued as a consultant to the operations evaluation group, and when or expanded into other services and countries he participated in the weapons systems evaluation group (wseg), formed in 1949 to carry out or work for the joint chiefs of staff and the united states secretary of defense, as well in the organizing of the nato advisory panel on operations research. he participated in the founding of the operations research society of america (orsa) in 1952 and was a member of orsa's first council. he was elected orsa's president in 1964.