Keith is a member of the Pawtucket Brewery's accounting team in "Vat Man and Rob 'Em".
Keith is known throughout his workplace for keeping a guitar in his office and constantly bringing it up to his colleagues, in hopes of someone asking him to play a song. Such a habit even comes at the cost of his time spent at home with his family. Keith becomes a regular patron after Peter turns the brewery into an after-hours bar, often singing songs that come with needlessly lengthy exposition, although his singing is noted to be okay. Keith later appears at the end, about to sing a variant of "99 Bottles of Beer on the Wall".
In "Gift of the White Guy", Keith interrupts a meeting, looking for an excuse to play his guitar again. Peter reveals that he received his guitar from a White Elephant gift exchange held by the company.