Mr. Jon Callas is a Co-Founder of Dark Mail Alliance. He is also an angel investor. He also serves as Advisor at Ten Eleven Ventures. He was a Co-Founder & served as the Chief Technology Officer at Silent Circle. Prior to joining Entrust, Callas co-founded PGP Corporation which specialized in email and data encryption software. Over the course of more than fifteen years, Callas held leadership functions including CTO and CSO. Most recently, he also served as an operating system security expert with Apple. Additionally, he has held leadership positions with corporations including Wave Systems Corporation, Digital Equipment Corporation and Counterpane Internet Security Inc. He has also authored several Internet Engineering Task Force (IETF) standards including OpenPGP, DKIM, and ZRTP. He serves as an Advisor at ten Eleven Ventures.