Shmuel Himelstein , Jewish Day School, NYC, teacher, 1964-68, assistant principal, 1968-70; Jewish Day School, Los Angeles, CA, principal, 1970-73; Jewish Day School, Winnipeg, Canada, principal, 1973-75. Currently working as a translator, writer, and editor in Israel. Professor Yeshayahu Leibowitz , an acclaimed scientist and Judaica scholar, is renowned for his widely respected-and debated-approach to Jewish tradition and philosophy. He served as Editor-in-Chief of the Encyclopedia Hebraica and was head professor of the science department at the Hebrew University. Born in Riga in 1904, and educated in Germany and Switzerland, he immigrated to Israel in 1935 and passed away in Jerusalem in 1994.