Korsemann was born in Nebel and took part in the First World War as a soldier in the Imperial German Army, receiving the Iron Cross 1st and 2nd class and the Wound Badge in black.

[1] After returning to Germany, Korsemann joined the Nazi Party (membership number 47,735) and its paramilitary unit, the Sturmabteilung (SA), in November 1926.

In this capacity, he acted on behalf of HSSPF Erich von dem Bach-Zelewski who was on extended assignment as the leader of all anti-partisan activities.

Korsemann wrote to the Wehrmacht commander who led the withdrawal, Generalfeldmarschall Ewald von Kleist, requesting a letter of exoneration.

From January 1944 until the end of the war, Korsemann was deployed at the eastern front as an SS-Hauptsturmfuhrer, commanding a company of the 3rd SS Panzer Division Totenkopf.

He never stood trial for his Holocaust-related crimes in the Soviet Union, and lived in West Germany until his death in Munich in 1958.