Luke Wroblewski - Mobile UX Expert
Luke Wroblewski is hands down one of the best teachers of mobile UX design trends. A true UX guru, who has the data to back up his theories. Currently he's a Product Director at Google
His 6th Conversation@Google talk was just released. You should go back and watch the 15+ hours of past talks. Each talk crams in a ton of the latest data on mobile usage and interaction trends, combined with mobile UX design advice.
Luke has published a 3 books. (Highly recomend his works on form design). A website with over 1000 articles, and lots of archived slide decks. His twitter feed is worth a follow.
Conversions@Google talks: collated playlist. Six to date.