Ed Catmull, who's the creative mind behind top-grossing animated films 'Frozen' as well as 'Toy Story 3', has revealed the inspiration for his work in his new book 'Creativity Inc.'

The 69-year-old President of both Walt Disney and Pixar Animation Studios said that Walt Disney and Albert Einstein were his heroes growing up, and he wanted to be an animator, but didn't know how to go about it as there weren't any schools for it, ABC News reported.

In the book, Catmull, who helped create the entire field of computer animation, said that his first job was with George Lucas for his 'Star Wars' films, while asserting that it was Lucas who encouraged him and his creative partner John Lasseter to `use the force`.

He also gave credit to Steve Jobs, who acquired Pixar from Lucasfilm, saying that Jobs saw their passion and helped in making 'Toy Story', which was the first feature-length animated movie ever, released in 1995.

Catmull had also contributed in 1976's 'Future World', which used computer graphics for the first time ever through his piece of code called the `Catmull spine,` which later became a foundation for many memorable effects.