For example, are you referring to:
* Walt Disney: If so, his first creation was a short animated film called "Alice's Wonderland" in 1923. It was a live-action/animation hybrid film.
* Walt Whitman: If so, his first published work was a collection of poetry titled "Leaves of Grass" in 1855.
* Walt Kowalski: If so, he was a fictional character played by Clint Eastwood in the movie "Gran Torino" (2008).
Once you specify who you are asking about, I can give you a more accurate answer!