In 1904 he accepted the chair of mathematics at Greifswald when his friend Eduard Study resigned the chair. Engel's final post was the chair of mathematics at Giessen which he accepted in 1913 and he remained there for the rest of his life.
Sa 1904 tinanggap niya ang mga upuan ng matematika at Greifswald kapag ang kanyang mga kaibigan Eduard Study kalooban ng upuan. Engel's huling paskil ay ang upuan ng matematika at Giessen na siya tinanggap sa 1913 at siya ay nanatili doon sa ang magpahinga ng kanyang buhay.