Texas,[5] From 1919 to 1921 he served overseas as first Lieutenant as assistant superintendent and director of ports in Great Britain, and at the United States Shipping Board.
[6] From 1922 to 1934 Zimmerman was employment and personnel manager at the Continental Oil Company, now Conoco, Ponca City, Oklahoma.
[10] By 1940 Zimmerman had joined the staff of the United States Civil Service Commission,[11] where bin 1943 he served as executive assistant to the Chairman of the Council of Personnel Administration.
Mary Cushing Niles had served in the United States Civil Service Commission from 1941-1957 as Assistant the Chairman of the Federal Personnel Council.
[20][21] From 1944 to 1946 Zimmerman had served as national president of the Society for Advancement of Management (SAM) as successor of Percy S. Brown, and was succeeded by Harold B.