Muller was born in the 4th of December 1911 he would become the most successful single engined night fighter Ace of the Luftwaffe.  Before World War II Muller flew as a Lufthansa pilot, as soon as War broke out he was transferred to a bomber and transport pilot. Muller scored his first victory on the 4th of July 1943, three more followed in quick succession. Muller flew a total of 52 night fighter missions and finished the War with 30 victories.