Born in Lewisburg, Pennsylvania, 8 October 1905, Nelson Daniel Zimmerman graduated from Pennsylvania State College with the degree of Bachelor of Arts. He attended the University of Pennsylvania, Law School from which he received the degree of Bachelor of Laws. Prior to entering Naval Service he was a Special Agent for the Federal Bureau of Investigation.
Reporting for active duty as a Lieutenant (junior grade) in the US Naval Reserve, he was assigned in May 1941 to the District Intelligence Office in the Ninth Naval District with headquarters at Great Lakes, Illinois. Late in 1942 he was transferred to the District Intelligence Office, Tenth Naval District, San Juan, Puerto Rico, where he remained until the fall of 1944. He next served in the Office of Naval Intelligence, Navy Department and in December 1945 became a member of the United States Naval Technical Mission to Japan.
He was released from active duty in the summer of 1946 and served in an inactive capacity until September 1948, when he was again ordered to active service. Assigned to the Office of Naval Intelligence, he continued to serve there until March 1957, after which he had duty in the Tenth Naval District, with headquarters in San Juan, Puerto Rico. From June 1959 until April 1962 he was Director of the Security Policy and Programs Branch, Office of Naval Intelligence, and next served as District Intelligence Officer in the Ninth Naval District, with headquarters at Great Lakes, Illinois.
On 1 July 1963 he was transferred to the Retired List of the US Navy.
A lawyer, Captain Zimmerman was a member of the American Bar Association and the Chicago Bar Association and had been admitted to practice before the Supreme Courts of the United States, Pennsylvania and Illinois.
Commissioned Lieutenant (jg), USNR, 31 December 1940
Lieutenant, USNR, 1942
Lieutenant Commander, USNR, 1 July 1943
Commander, USNR, 20 July 1945
Captain, USNR, 1 July 1956
Transferred to Retired List of USN, 1 July 1963
Naval Reserve Medal
American Defense Service Medal
Asiatic-Pacific Campaign Medal
World War II Victory Medal
National Defense Service Medal
Chronological Transcript of Naval Service:
May 1941 Nov 1942 9th Naval District, Great Lakes, Ill. (District Intelligence Office)
Nov 1942 Oct 1944 10th Naval District, San Juan, P.R. (District Intelligence Office)
Nov 1944 Dec 1945 Office of the Chief of Naval Operations, Navy Dept. (Office of Naval Intelligence)
Dec 1945 Jul 1946 Naval Technical Mission to Japan (member)
Jul 1946 Sep 1948 Inactive
Sep 1948 Mar 1957 Office of Naval Intelligence, Navy Dept.
Apr 1957 Jun 1959 10th Naval District, San Juan, P.R.
Jun 1959 Apr 1962 Office of Naval Intelligence, Navy Dept. (Director, Security Policy and Programs Branch)
May 1962 District Intelligence Officer, 9th Naval District, Great Lakes, Ill.
1 July 1963 Transferred to Retired List of U.S. Navy
Captain Zimmerman died 1 December 2003.