From 1908-10 he was a special lecturer on works management at the Massachusetts Institute of Technology.

He later was a special lecturer there.

Currently he works as a special lecturer at National Yang-Min University.

He also worked as a special lecturer at the UI law school from 1933 to 1941.

From 1961-63 he was a special lecturer at the University of Toronto, Canada.

He continued an association with Cornell as a special lecturer from 1893 to 1895.

He was also a special lecturer for New York University Law School, 1893-1900.

He was also a special lecturer for the Department of Philosophy in the University of Chicago.

At the age of twenty, he became special lecturer in moral philosophy there, at the same time practising law.

He retired in 1990 but continued as a special lecturer until 1994.