In 1892, Witmer left Germany and returned to the University of Pennsylvania, becoming the Director of The Laboratory of Psychology, effectively filling the shoes left by his old advisor, James McKeen Cattell.
Witmer left Germany. This was in 1892. Witmer returned to the University of Pennsylvania, effectively filling the shoes. This was in 1892. These shoes were left by his old advisor. Witmer was becoming the Director of The Laboratory of Psychology. This was in 1892. Witmer was filling the shoes left by his old advisor. This was in 1892. James McKeen Cattell was his old advisor.