No doubt Zeev and Andi as well!!
I probably wouldn't be working where I am right now w/o Zend and their Zend Core product. Those 2 pretty much brought PHP to Big Blue and their 400 in 2006. Now the 400(sorry bad habit... iSeries) ships w/ PHP, MySQL that rides on top of DB2 and Zend Framework!
It's amazing to think how fast PHP has grown... For me it's been a lot of catch-up and learning. Good thing there is phpbuilder.com!