Jon Callas is an American computer security expert and Chief Technical Officer of Entrust

Entrust

Entrust Inc. is a $100 million privately-owned software company with 350 employees. It provides identity-based security software and services in the areas of public key infrastructure , multifactor authentication, Secure Socket Layer certificates, fraud detection, digital certificates and mobile...

. Callas has a long history of work in the computer security field, and is a frequent speaker at industry conferences. Additionally, Callas is a contributor to multiple IETF RFC

Request for Comments

In computer network engineering, a Request for Comments is a memorandum published by the Internet Engineering Task Force describing methods, behaviors, research, or innovations applicable to the working of the Internet and Internet-connected systems.Through the Internet Society, engineers and...

s. Prior to his work at Entrust, he was Chief Technical Officer and co-founder of PGP Corporation

PGP Corporation

PGP Corporation, co-founded by Jon Callas and Phil Dunkelberger, is based in Menlo Park, California. PGP Corporation was funded by Rob Theis, General Partner, Doll Capital Management and Terry Garnett, General Partner, Venrock Associates. The company is the current owner of the Pretty Good Privacy...

.

He has also worked for Bruce Schneier

Bruce Schneier

Bruce Schneier is an American cryptographer, computer security specialist, and writer. He is the author of several books on general security topics, computer security and cryptography, and is the founder and chief technology officer of BT Managed Security Solutions, formerly Counterpane Internet...

's Counterpane Internet Security, and was Chief Scientist of the original PGP, Inc. founded by Phil Zimmermann

Phil Zimmermann

Philip R. "Phil" Zimmermann Jr. is the creator of Pretty Good Privacy , the most widely used email encryption software in the world. He is also known for his work in VoIP encryption protocols, notably ZRTP and Zfone....

. Callas is a member of the Infosec think tank

Think tank

A think tank is an organization that conducts research and engages in advocacy in areas such as social policy, political strategy, economics, military, and technology issues. Most think tanks are non-profit organizations, which some countries such as the United States and Canada provide with tax...

 The Shmoo Group.

He lives in the San Francisco Bay Area

San Francisco Bay Area

The San Francisco Bay Area, commonly known as the Bay Area, is a populated region that surrounds the San Francisco and San Pablo estuaries in Northern California. The region encompasses metropolitan areas of San Francisco, Oakland, and San Jose, along with smaller urban and rural areas...

with his wife Tamzen.