 After his wedding, Rabbi Lefkowitz began learning in Kollel Toras Eretz Yisrael in Petah Tikva.He also began giving regular "shiurim" (Torah lectures) in his father-in-law's yeshiva, Tiferes Tzion, a position he held until his final days more than 70 years later.He began giving a nightly "shiur" to "baalebatim" (working men) in the Chazon Ish's home in 1953; he also continued this "shiur" until his final days.