The IMU regrets to announce that Joseph Baruch Muskat, professor emeritus at Bar-Ilan University, has passed away.  He worked in number theory, specializing in algorithmic methods in number theory, and was a leading figure in the mathematics and computer science department at Bar-Ilan from 1970 and well past his retirement in 2003 and last course in 2011, warmly welcoming new immigrant faculty and first-year students alike.