Education
Overmans joined the Bundeswehr in 1972, and studied economics at the Bundeswehr University Munich from 1974 to 1977. He completed his Doctor of Philosophy in 1982–1986 at the Bundeswehr University Hamburg.
Overmans joined the Bundeswehr in 1972, and studied economics at the Bundeswehr University Munich from 1974 to 1977. He completed his Doctor of Philosophy in 1982–1986 at the Bundeswehr University Hamburg.
His work "German Military Losses in World World War II", which he conducted as leader of a project sponsored by the Gerda Henkel foundation, is the most complete reference work about German casualties in World World War World War II From 1987 to 2004 he was a research associate at the Military History Research Office (MGFA), first in Freiburg and later in Potsdam. In 1996 he received his doctorate in history with the seminal work German Military Losses in World World War II at the University of Freiburg. This study was first published in 1999 in Munich by Oldenbourg Verlag.
From 1996 to 2001, Overmans lectured at the History Department of the University of Freiburg.
Until his retirement in 2004, he had reached the military rank of lieutenant colonel. Since then he has worked as a freelance historian.
He participated in a commission which issued an opinion to the number of victims in the Dresden bombing in February 1945.