Rabbi Elchanan (Arnold) Greenman studied Talmud and Codes for four years with Rav Aharon Soloveichik at Yeshivas Brisk of Chicago, where he received his rabbinic ordination in June, 1977. Rabbi Greenman has a B.S. in Physics and a M.S. in Computer Science and has presented technical papers in the area of space robotics. He served as a kollel and faculty member for three years at Yeshiva University of Los Angeles and has continued to teach adult and young adult classes for more than 20 years, in Chicago, IL, Los Angeles, CA and Houston, TX. Rabbi Greenman has provided significant assistance to the Jewish law segments of various comparative law articles coauthored by Yale and Irene Rosenberg, chaired law professors at the University of Houston Law Center. Even though Rabbi Greenman has been employed as an engineer for the International Space Station for almost 20 years, and is currently the Lead Engineer for Software Quality Engineering, his first love is Torah study and he has a special interest in the writings of HaRav Naftali Tzvi Yehuda Berlin, commonly referred to as the Netziv. He and his wife Betty reside in Houston, TX and have eight children and two grandsons.