Mr. Mallow, 72, a resident of Lighthouse Point, FL, had been in ill health recently. He is credited with introducing small towns and medium-sized cities in North America to Broadway plays and musicals, often offering shows in stays as short as one night. At one point during his career as a producer and presenter, he and his company, Janco Productions, named after his business partner and wife, Jan, had as many as 200 cities to choose from, from Scranton to Denver and beyond.