Professionally , he qualified as a road and highway superintendent .
A student at Berlin Institute of Technology and ParisTech between 1925 and 1931 , Roller also joined the Communist Party of Germany in 1926 and the French Communist Party in 1928 , working on their publications .
Professionally , Roller qualified as a road and highway superintendent .
A student at Berlin Institute of Technology and ParisTech between 1925 and 1931 , Roller also joined the Communist Party of Germany in 1926 and the French Communist Party in 1928 , working on their publications .