Jon Callas
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Jon Callas is an American computer security expert, software engineer, user experience designer, and technologist who is currently an advisor at Ten Eleven Ventures. He previously co-founded Silent Circle and served as its CTO. Earlier in his career, he held roles at Digital Equipment Corporation, Apple, PGP, and Entrust, including serving as CTO and co-founder of PGP Corporation and as CTO of Entrust. He is known for creating several Internet Engineering Task Force standards, including OpenPGP, DKIM, and ZRTP.
Updated 9 October 2026
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