Who is Chris?

Rules

To play simply guess the inspiration for Chris's avatar when you notice it has changed.

1. The avatar change will not be announced and will occur randomly, even potentially multiple times a day.
2. For fairness the avatar change will be within overlapping working hours for everyone and will not occur during or shortly after a conversation with someone.
3. Guesses must be made publicly in the #who-is-chris channel in slack to count.
4. Guesses may be the person's first name, nickname or surname as long as the name is a recognisable version of the person's name.
5. Guesses only count after the avatar update is done (you cannot guess a change in advance).
6. Guesses will not count if edited and contested, ideally post a new message if you wish to guess another name.
7. The winning guess will be the first based on slack timestamp, in the event of a tie both players will be awarded a point.
8. Bonus rounds award extra points and will follow the same guessing format, but the picture will be hidden somewhere.