Alex created the yepnope.js library and is on the Modernizr team and a couple fake/nonvoting/volunteer jQuery subteams that deal with bug triage and docs. He is running TXJS 2011 on June 11. He also has a website.
Modernizr was one of the first libraries on the scene in the 'new-world feature testing religion.' Modernizr 2 is just around the corner and there are some nifty new features in there to help you build modern web apps. Some time would and will be well spent going into how to use Modernizr, but there will also be some more in depth looks into the internals of the core library, build tool, Modernizr.load and into how to extend all of these things for great good. HTML5 today. Straight up.
Did we mention we are giving away a ticket to TXJS? It's sold out, btw.