Technology VP Kevin Lynch can be argued as the person who nailed down how to make the Apple Watch operate properly, but we all know that Jony Ive's industrial design and engineering prowess made it into the most-wearable-...wearable on the market right now.
Brief reminder: Ive had joined Apple under John Sculley's [mis]management and was given looser reins once Steve Jobs returned. Every Apple product since the iMac bears his mark. He built Apple's design studio into one of the tightest groups of any manufacturing company.
Where Apple goes from here, we'll find out eventually. As blogger John Gruber says, we'll still be seeing Ive-designed hardware five years from now.
Apple's press release:
Gruber's post (which is how I learn the news):