Harold Samuel Kushner is a prominent American rabbi aligned with the progressive wing of Conservative Judaism, and a popular author. 

He is the author of a best selling book on the problem of evil, When Bad Things Happen to Good People. Written following the death of his son, Aaron, from the premature aging disease progeria, the book deals with questions about human suffering, God, omnipotence and theodicy. Aaron was born in 1963 and died in 1977; the book was published in 1981.

Kushner has written a number of other popular theological books, such as How Good Do We Have to Be? (Dedicated to his grandson, Carl), To Life! and many others. In collaboration with the late Chaim Potok, Kushner co-edited Etz Hayim: A Torah Commentary, the new official Torah commentary of the Conservative movement, which was jointly published in 2001 by the Rabbinical Assembly and the Jewish Publication Society. His Living a Life That Matters became a best seller in the fall of 2001. Kushner's book, The Lord Is My Shepherd, was a meditation on the Twenty-Third Psalm released in 2003. Kushner also wrote a response to Simon Wiesenthal's question of forgiveness in the book The Sunflower: On the Possibilities and Limits of Forgiveness.