The successor to Klein was not easily found. Carathéodory came and went in less than three years while he was followed by Hecke who also left quickly in 1919. Landau worked hard to have Schur fill the chair but, against Landau's wishes, Courant was appointed.
Ang kapalit sa Klein ay hindi madaling matagpuan. Carathéodory ang dumating at nagpunta sa mas mababa kaysa sa tatlong taon habang siya ay sinundan sa pamamagitan ng Hecke na rin sa kaliwa mabilis sa 1919. Landau nagtrabaho nang husto upang magkaroon ng Schur punan ang upuan ngunit, Landau laban sa mga hangarin, Courant ay hihirangin.