Neuendorf launched in both the 1964 Olympic Winter Games of Innsbruck and 1968 in Grenoble on the normal and large hill. In the special jumping he was fifth and seventh, on the large hill he was eighth and fifteenth. At the Nordic World Ski Championships in 1966 he was runner-up on the normal hill with jumps on 79.5 and 77.5 meters. After jumping 75 and 81 meters on the large hill, he only finished 18th. He also won three individual competitions at the Four Hills Tournament and was second overall in 1965/66 and third in each of the following two years. In 1965 in Johanngeorgenstadt he became GDR champion on the normal hill in front of Peter Lesser and on the large hill in front of Dieter Scharf and Alfred Brettschneider . The double success was repeated in 1966. On March 27, 1966, he came third in ski flying in Planica (Yugoslavia). He won his last GDR championship in 1967 on the normal hill.
In 1971 he ended his career and became a coach. For this activity he received the Order of Labor Banner in 1976 .
GDR
