Nathan Richardsson no longer works for Trion Worlds, according to an entry on his LinkedIn profile. The MMO industry veteran served as Defiance's VP of Development and its Executive Producer beginning in October, 2012.
Prior to that, Richardsson was a CCP board member and held various producer jobs on EVE Online from 2002 through 2012.
The LinkedIn entry lists Richardsson's Trion tenure under the "past" subheading, and it also mentions an ending date of July, 2013. Massively confirmed Richardsson's departure with Trion earlier this afternoon, but the company declined to comment further.
[Update]: New Defiance executive producer Chris Lena has penned an introductory blog post.
[Thanks to our tipsters!]