Rabbi Reuven Chaim Klein is an author and freelance editor/subject-matter expert, specializing in Jewish thought, language, and history. He holds an M.A. in Jewish Education from Middlesex University in conjunction with the London School of Jewish Studies and received rabbinic ordination from Rabbi Moshe Sternbuch (Yoreh Yoreh). He is the author of Lashon HaKodesh: History, Holiness, & Hebrew (Mosaica Press) and God versus Gods: Judaism in the Age of Idolatry. Klein's monthly column “Names & Numen” in the Jewish Press explores the etymology and significance of Jewish names, and his weekly column "What's in a Word?" about Hebrew synonyms appears in a range of publications including The 5 Towns Jewish Times (NYC), Jewish Tribune (UK), OhrNet (Online) and Times of Israel (Israel). He is currently a researcher for Oz V’Hadar’s Mishnayos Shearim project.