[1] He finished twelfth in the 5000 metres at the 1958 European Championships, sixth in the 3000 metres steeplechase at the 1960 Summer Olympics, and competed at the 1962 European Championships without reaching the final.
He also became national cross-country champion (long race) in 1959 and 1960, and won a solitary bronze medal in the 10,000 metres.
He represented the sports clubs Weseler TV until 1959, FSV Frankfurt until 1961, and KSV Hessen Kassel from 1962.
[4][5][6][7] Indoors, he became national 3000 metres champion in 1959 and won three additional medals.
[2] Müller died in Kassel on 26 January 2022, at the age of 90.