Keeping track of people's faces at conferences can be a daunting task, but on PHP developer has his own method. Cal Evans (of the Zend Developer Zone) has created his own Flash cards of the "who's who" in the PHP community. Wez Furlong has this post documenting the fact.
Luckily for you, Terry Chay was on hand to document them. You can see more of these on Terry's flickr stream.
Wez comments that there also seemed to be problem with the run (more than one Zak?).