Microsemi Corp. of Irvine, Calif., a manufacturer of high performance analog and mixed signal integrated circuits and semiconductors, announced that Bel Lazar has joined the company as senior vice president of operations. Lazar comes to Microsemi from International Rectifier, where he was vice president of the Aerospace & Defense business unit, where he was responsible for operations in Leominster, Mass.; Santa Clara, Calif.; and in Denmark.