John Williams was using Rails as a systems engineer at Contegix, but is now par of the operations team at 37signals. I'm not sure what John is going to talk about. He mentioned "Chose Your Own Adventure" which takes me back to happy childhood memories. I can't wait to hear about this. He also mentioned performance tuning and chef so we'll see what delight he brings to us.
Zach can't make it and will be rescheduled - Zach Briggs, or theOtherZach as he is often known, will be delighting us with a grand talk. Zach wrote his first Rails app in June of 2012 and is already very accomplished. He spoke this year at both Ruby Midwest and RailsConf. He enjoys great beer and whiskey. Zach loves long moon lit walks down dark alleys. Giving back to the community and being there as a pair are just some of the reasons Zach has leveled up so quickly.