He is the author of several works of Jewish law, including "Shevet HaLevi" ("The Tribe of Levi"), a comprehensive series of halakhic rulings and responsa on Jewish laws comprising ten volumes, and several other Torah books all bearing the same name. His halakhic opinions are widely quoted in many works on Jewish law both in Hebrew and English. On May 20, 2012 Ichud HaKehillos LeTohar HaMachane held an "asifa" (gathering) at Citi Field in Queens to address the dangers of the internet. Wosner spoke via live hookup from Israel to the 60,000 attendees. He banned unfiltered internet use for the Jewish community and allowed filtered internet only for business purposes. He died in Bnei Brak at 101 years of age.