Jon Callas is an American cryptographer, inventor, and
entrepreneur. He is the co-founder and CTO of Silent Circle, an encrypted communications firm that provides secure communications
services for mobile devices. Callas is also the co-founder of PGP
Corporation, a computer software company that has received numerous innovation awards for its encryption technologies. He is the
creator of Apple’s Whole Disk Encryption system. Callas is
considered one of the top security software engineers in the world and is
currently an adjunct professor at Indiana University.