After the Franco-Prussian War and the unification of Germany in 1871, he moved to Berlin and after some time achieved recognition for his ornamental work in the Tiele-Winckler Palace [de].
After a visit to Italy he again studied painting in Munich and in 1884 returned to Berlin, where he was awarded a gold medal in 1886, was elected member of the Academy in 1893, and was made professor in 1896.
He sculpted Frederick Barbarossa for the Kyffhäuser Monument; a statue of Labor for the Reichsbank building in Berlin; and Centaur with Dancing Nymph for the National Gallery.
He produced a tall relief frieze for the Soldiers' and Sailors' Monument in Indianapolis, Indiana.
Geiger died in Wilmersdorf (today part of Berlin), after suffering an internal bleeding.