When Disney purchased Pixar, Ed Catmull was named president of the two animation studios and he oversaw the business side of things while John Lasseter oversaw creative until he stepped down this summer and was replaced by Pete Docter at Pixar and Jennifer Lee at Walt Disney Animation studios.
During his time as president Ed Catmull was involved in numerous hits for both studios, including Frozen, Toy Story 3 and Incredibles 2.