Rabbi Abba Zvi Naiman is the Mara D’Asra of the Bais Medrash of Ranchleigh in Baltimore, Maryland, where he gave this series of shiurim on Choshen Mishpat.
He was also a senior author for the Schottenstein editions of Talmud Bavli and Talmud Yerushalmi (ArtScroll/Mesorah) and is now working on the new Milstein Edition of The Chumash with the Teachings of the Talmud. He has published other sefarim as well, including the The Elucidated Derech Hashem, The Elucidated Maamarei HaRamchal, and annotated Hebrew editions of the Ramchal's Derech Eitz HaChaim and Maamar HaGeulah.
For free download of PDF files handed out at the shiurim, and for more information about his sefarim, see ZichronYaakovEliyahu.org.