JL;DR SUMMARY The book "A Flock With No Shepherd: Shas Leadership The Day After Rabbi Ovadia Yosef," co-authored by Yair Ettinger and Nissim Leon, examines the challenges facing the Shas movement following the death of its prominent founder Rabbi Ovadia Yosef in 2013. A way out west there was a fella, fella I want to tell you about, fella by the name of Jeff Lebowski.