Who was the original illustrator of Mister MaGoo and when?

"Mr. Magoo's first appearance was in the theatrical short cartoon The Ragtime Bear (1949), scripted by Millard Kaufman. His creation was a collaborative effort; animation director John Hubley is said to have partly based the character on his uncle Harry Woodruff,[2] and W. C. Fields was another source of inspiration. In a legend circulating among medievalists, Harvard professor Francis P. Magoun is also said to have been the model for the character."

https://en.wikipedia.org/wiki/Mr._Magoo

Don Duga is the storyboard artist behind many of the unforgettable images including commercials and is an industry veteran and has storyboarded such classics as Mr. Magoo and Underdog.

https://archive.hudsonreporter.com/2003/12/01/he-drew-frosty-and-mr-magoo-legendary-animator-don-duga-to-display-works-in-hoboken/