He has been with Microsoft for about 20 years, has been in touch with Windows Phone since the beginning, including the Zune software experience.
What if you could ask Joe anything? This Friday, May 2nd, Joe Belfiore will be holding an AMA on Reddit beginning at 9:00am Pacific time. “I've been looking forward to talking to you all about WP in more depth... and now that WP8.1 is out in the Developer Preview, it's a great time to answer your questions. Get them ready!”
Joe Belfiore is not just that guy that is always there, he has proven to be an effective evangelist for the platform. His excitement over the things to come with Windows and Windows Phone 8.1 was evident, and genuine at Build 2014 (he danced on a floor piano).
So, what will you ask Joe?
sources: Reddit via WMPoweruser