Evan James Williams was a mathematician and physicist who made outstanding contributions to atomic physics, especially when working with Niels Bohr. During World War II he worked for the Admiralty applying methods of Operations Research to deal with the problem of German U-boats. It is claimed that his contributions led to the defeat of the U-boat campaign which made planning for the Allies to invade Europe possible.
Find out more at: https://mathshistory.st-andrews.ac.uk/Biographies/Williams_Evan/