Deen first became known as the author of the blog, "Hasidic Rebel," which he wrote from 2003 until 2012, and which was the subject of a 2003 feature article in the "Village Voice". Deen's blog was the first widely read website by a practicing Hasid casting doubt on his religious faith. His memoir chronicles his often painful change from a devout member of the Skverer Hasidic community in New Square, New York to a secular Jew.