"No, I'm not interested in developing a powerful brain. All I'm after is just a mediocre brain, something like the President of the American Telephone and Telegraph Company"

This quote by Alan Turing is a humorous method of expressing his lack of interest in establishing a powerful brain. He is suggesting that he does not require a powerful brain, however rather an average one, like the President of the American Telephone and Telegraph Company. This is likely a reference to the truth that the President of the American Telephone and Telegraph Company is not always understood for their intellectual prowess, however rather their capability to handle a large business. Turing is indicating that he does not need an effective brain to be effective, however rather an average one. This quote is a funny method of revealing his absence of interest in establishing a powerful brain, and his belief that a mediocre brain is enough to be effective.