Ed Aardal lived from 1910 to 1988. He worked for Disney for twenty years starting in 1935. He originally did effects animation, but was soon sent over to the character animation department.
Perhaps because of his effects background Ed was assigned to complex scenes like this one from Lady and the Tramp.
It is amazing to realize that in the final film you barely see a dark silhouette of the dog catcher's wagon, taking Tramp to the dog pound. Yet in animation every detail was analyzed as if this was a daytime scene.
Ed Aardal is one of those unsung heroes who we need to shed light on for his important body of work in animation. I believe this was his last film for Disney before moving on to other studios like Hanna Barbara. An animation legend!
For a 1984 interview with Ed go here: