Paul Klein began his studies and apprenticeship at the Bauhaus (1921-22) under Dorfner where he led the binding workshop, and continued on with Dorfner as a journeyman after Dorfner left the Bauhaus. He later led the hand-binding division of Th. Knaur in Leipzig (a large firm) and subsequently went to work as a binder and designer at Hübel & Denck, also in Leipzig.