sentences:  In October 1938, Quimby, coming full-circle, hired Hugh Harman and Rudolf Ising as the new creative heads of the studio, acting as both directors and producers, and in charge of many of the employees who had defected from the Harman-Ising studio a year before.Among Ising's first new cartoons for MGM was 1939's "The Bear Who Couldn't Sleep", the debut appearance of Barney Bear, a lumbering anthropomorphic bear based upon both Wallace Beery and Ising himself.Barney Bear would become MGM's first original cartoon star, regularly featured in cartoons until 1953, although his popularity never rose to the level of Mickey Mouse or Porky Pig.