Which company designed "Izzy" the official mascot of the Atlanta 1996 Summer Olympics?

Izzy was the official mascot of the Atlanta 1996 Summer Olympics. Initially named Whatizit ("What is it?") at its introduction at the close of the 1992 Summer Olympics in Barcelona, the animated character with the ability to morph into different forms was a departure from the Olympic tradition in that it did not represent a nationally-significant animal or human figure.

In 1991, the Atlanta Committee for the Olympic Games (ACOG) began a search for a mascot with a competition of twenty design firms as well as suggestions from the general public. The selection, Whatizit, was designed by John Ryan, senior animation director of Atlanta-based design firm DESIGNefx. Whatizit originally appeared as a blue, tear-shaped "blob" with rings around his eyes and tail. He wore high-top sneakers and had star-shaped pupils. His arms and legs were also short with a toothy grin showing both rows of teeth. He was later modified to have longer limbs to give a more athletic look.

After a very critical reception to Whatizit's introduction during the closing ceremonies of the 1992 Barcelona Olympics, ACOG began work to reshape the character specifically focusing on children, who were far more attracted to the character than adults.

In addition to renaming him "Izzy", several changes were made to the mascot's appearance including losing the bottom row of teeth, adding a nose, making the tongue visible, and making the limbs longer, skinnier, and more athletic.