Sherri Mandell is an Israeli-American author, mother and activist. She is best known as the mother of Koby Mandell, a thirteen-year-old American boy who was murdered near their home in Tekoa in May 2001. Sherri Mandell and her husband, Rabbi Seth Mandell, founded the Koby Mandell Foundation, and she wrote a book about the murder, The Blessing of a Broken Heart.