Keith Gerald "Jerry" Holkins (born February 6, 1976), is the writer of the popular webcomic Penny Arcade. Holkins goes by the pseudonym "Tycho Brahe" online. This is also the name of one of the two main characters of Penny Arcade, who is a cartoonized self-insertion of Holkins. However, as the character of Tycho was not originally meant to represent Holkins, the two have few physical similarities; they are primarily similar in their various interests and attitudes.