Which author created a character who describes himself as a "Bear of Very Little Brain"?

Alan Alexander Milne (8 January 1882 – 31 January 1956) was an English author, best known for his books about the teddy bear Winnie-the-Pooh and for various poems. Milne was a noted writer, primarily as a playwright, before the huge success of Pooh overshadowed all his previous work. Milne served in both World Wars, joining the British Army in World War I, and as a captain of the British Home Guard in World War II.

He was the father of bookseller Christopher Robin Milne, upon whom the character Christopher Robin is based.

In the novel "The House at Pooh Corner" (1928) during chapter six In which Pooh invents a new game and Eeyore joins in. Pooh says the following quote:

"When you are a Bear of Very Little Brain, and you Think of Things, you find sometimes that a Thing which seemed very Thingish inside you is quite different when it gets out into the open and has other people looking at it".