"Rabbi Chayim S. Chasan" was one of the pseudonyms used by Hallie Lynn (Chaya Sarah) Cantor, writer and associate editor of THE JEWISH READER.
How the medieval Torah commentator Ramban (Nachmanides) found his teachers.
Chasan, C.S. (1992, April / Nissan 5752). The Ramban Rabbi Moshe ben Nahman: The education of a giant. The Jewish Reader, 4,8, 21-23.
*This is constructed from limited available data and may be imprecise.