Final answer:
After Harman and Ising left, Leon Schlesinger hired notable animators such as Tex Avery, Bob Clampett, Friz Freleng, and Chuck Jones, who significantly contributed to the Looney Tunes and Merrie Melodies series.
Step-by-step explanation:
After Harman and Ising left, Leon Schlesinger hired a number of talented animators to continue the production of cartoons at the Warner Bros. animation studio. One of the most notable hires was Tex Avery, who became famous for creating some of the most iconic characters and directing many classic animated shorts. Along with Avery, Schlesinger also brought in talents like Bob Clampett, Friz Freleng, and Chuck Jones, who all played significant roles in the development of the Looney Tunes and Merrie Melodies series. These animators contributed to the golden age of American animation and created a lasting legacy through their innovative work and memorable characters.