After the war he studied philosophy, psychology, and sociology at the Humboldt University of Berlin and the political science institute (Hochschule für Politik).

[1] Maaß worked as general manager of the Reich Committee of German Youth Associations (Reichsausschuß der deutschen Jugendverbände).

After the Nazis seized power in 1933 he lost this position because all youth organizations were forced to conform to the party line.

[1] Maaß turned down a teaching position at the Harvard University to continue his fight against National Socialism from within Germany.

[2] After the failure of Stauffenberg's attempt to kill Hitler, Maaß was arrested on 8 August 1944, and imprisoned at Ravensbrück concentration camp.