At Johns Hopkins he taught a course on the history of German thought, which was “one of his chief interests” because he was able to give consideration to the philosophy of history.
Di Johns Hopkins ia mengajar mata kuliah tentang sejarah pemikiran Jerman, yang merupakan "salah satu minat utamanya", karena dengan mempelajari ini Ia mampu memberikan pertimbangan kepada filsafat sejarah.