Rabbi Aryeh Kaplan - A Living Torah

 https://mishpacha.com/a-living-torah/

Rabbi Kaplan wrote ten highly-popular and influential books for NCSY, and they remain as relevant today as they were back in the 1970s. Some addressed the foundational principles of Jewish faith (Love Means Reaching Out, The Fundamentals of Jewish Faith, Jerusalem: Eye of the Universe) while others explored such central mitzvos as Shabbos, mikveh (The Waters of Eden), tefillin and tzitzis (G-d, Man, and Tefillin). At the behest of NCSY, he also authored a series of booklets, later combined into one volume entitled The Real Messiah, which debunked the claims of Christian missionaries who had become a real and growing threat as part of a well-funded, aggressive nationwide campaign to ensnare Jewish souls in messianic “Judaism.”