From 1963 to 1979 Kluxen taught as a full professor for middle and modern history at the University of Erlangen-Nuremberg.
In 1954, he habilitated at the University of Cologne on Das Problem der politischen Opposition.
Kluxen was Corresponding Fellow of the Royal Historical Society in London and was awarded the 1st Class of the Order of Merit of the Federal Republic of Germany.
Commemorative publications were dedicated to Kluxen after the completion of the sixtieth year of life in 1972 and on the occasion of his 85th birthday in 1996.
With this collection Kroll wants to provide "building blocks for a cross-border, pan-European view of history".