It turns out that the good folks at Guinness recently hired an Irish applied mathematician by the name of William Lee (not to be confused with Lee Williams) to model the bubble formation in stout. Not a bad way to make a living! The full article, including Dr. Lee’s findings, can be found here.
Amusingly, Dr. Lee is at the University of Limerick. This inspired the commentators of the above article to write such gems as:
These bright lads will soon be well known
For studying the physics of foam
Though they fell on their asses
While studying gases,
Not one failed to take his work home.
— Lou P.