He is noted for authorship of Israel Defense Forces‘s Code of Conduct. He wrote an influential defense of Israel’s ‘law of return‘, justifying it as a form of affirmative action, following periods in which Jews were not allowed to immigrate to many countries.
He also wrote about possible meanings to a Jewish and democratic state, the meaning of a Jewish collective and many other essays. His essays on Jewish subjects are collected in a book titled Ruach Ish (Spirit of a Man), published in Hebrew by Am Ovedpublication house. He is also the editor of the philosophy journal Philosophia. Kasher has contributed as well to the fields ofpsychology and ethics.