Guinness brewer

The Guinness brewer is an unnamed brewer of Guinness.

History
When Lisa stayed behind the tour of Guinness Brewery, she found out that the secret ingredient was bog (toilet) water and chocolate syrup. The brewer said that she may now know the secret ingredients but she would know the ratios. Lisa replied with "50/50?" and the man was overcome with annoyance.

Non-canon
His picture was seen when Lisa looked through her Ultranet Facebook friend requests.