When part of a sukkah is underneath a tree or overhang, is the remainder kosher?

Rabbi Yosef Kaiser was born and raised in Toronto, Canada. After learning in

the Mesivta of Long Beach. He spent many years studying in the Brisker Kollel in Eretz Yisroel after his marriage and then received semicha from Beth Medrash Govoha in Lakewood, NJ.

He currently resides in Monsey, NY, where he teaches in

Yeshiva Kesser Torah, and also gives r...