Career
He spent 11 years with Eintracht Braunschweig, including four seasons in the Bundesliga starting with the league"s foundation in 1963. After retiring as a player, Jäcker worked as a youth coach at Eintracht Braunschweig and for a time managed Regionalliga Nord side Leu Braunschweig. From 1980 to 1983 he also served as the president of Eintracht Braunschweig.