Listed here are world-leading experts on Cybersecurity.
 Dan Geer is a computer security analyst and risk management specialist. Some have said that he is the closest the field has to an actual philosopher of information security. See: The Science Of Security (and the Future).
Also by Dan Geer – Top 10 Cybersecurity Best Practices from Wired Magazine.
 Bruce Schneier (@schneierblog) is Chief Technology Officer at IBM’s Resilient, and is one of the most important “people to listen to” in IT security. Schneier Tweets about the latest big security firm happenings and what they mean for the enterprise.
 Philip R. “Phil” Zimmermann, Jr. (born February 12, 1954) is the creator of Pretty Good Privacy (PGP), 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. Zimmermann is co-founder and Chief Scientist of the global encrypted communications firm, Silent Circle.
Prominent people in cybersecurity are listed below (alphabetical order with Twitter handle, website address or email addresses shown).
Bill Brenner (@BillBrenner70) is the Senior Content Strategist at PKWARE, where he spearheads thought leadership on enterprise and government encryption issues. He engages his Twitter followers with thoughts on world news items and implications for IT security, and occasionally Tweets about The OCD Diaries, a personal blog he runs about overcoming anxiety.
Graham Cluley (@gcluley) is an InfoSec expert who’s worked for McAfee and was the Senior Technology Consultant at Sophos. These days, he’s an independent blogger, speaker and researcher, giving in-depth talks to both enterprise and public sector audiences and gaining visibility via such outlets as CNN, Fox, BBC and TechCrunch. He Tweets conversationally about security news of high value to individuals and corporate entities.
Gadi Evron (@gadievron) is the founder and CEO of Cymmetria, an innovative cybersecurity startup that flips the script on hackers with a “cyber deception” paradigm (full disclosure, they’re a client, but we’re so proud). He’s also a former VP of Cybersecurity Strategy at Kaspersky Lab and a highly-regarded consultant, writer and thought leader. He shares everything from what he thinks about Donald Trump to latest gadgets and industry news with the InfoSec community on Twitter and Facebook.
Nigel Gibbons(@NRG_fx) is managing director of Cordon Sanitaire. He’s extremely passionate about cloud computing, and loves to share information on cybersecurity, privacy, and the benefits of cloud technology.
Jeremiah Grossman (@jeremiahg) is the founder of WhiteHat Security and a well-known security expert and industry veteran. Prior to launching his company, Jeremiah was as an information security officer at Yahoo! and has been sharing his infosec knowledge on Twitter since 2008.
Mikko Hypponen (@mikko) is the Chief Research Officer of F-Secure and a well-known inventor, columnist and TED speaker. He has led efforts to defeat notorious security breaches and viruses, and is a consultant to several governments on information security. On Twitter, Hypponen is a whistleblower on IT security news that’s instantly relevant to both governments and enterprises.
Eugene Kaspersky (@e_kaspersky), Chairman and CEO of Kaspersky Lab, is winning the Twitter game. Far-flung from his humble start as a software engineer who sold antivirus solutions to just a handful of buyers, Kaspersky now spearheads one of the biggest security companies in the world. He regularly Tweets interesting, educational links from the Kaspersky blog and other popular InfoSec outlets.
Robert M. Lee (@RobertMLee) is the founder and CEO of Dragos Security LLC. Given his passion for security intelligence and his roles as an educator and public policy consultant, he’s become an InfoSec force, leading Forbes to name him one of 2016’s “30 under 30” for Enterprise Technology. On Twitter, Lee curates an interesting mix of “snackable” security policy news and in-depth articles on methodology.
Katie Moussouris (@k8em0) is a cybersecurity trailblazer. She was the architect of the first highly effective “bug bounty” programs for Microsoft and the U.S. government. Today, as the founder and CEO of Luta Security, Moussouris is a consultant in high demand by both private and public sector interests. She uses Twitter to talk about new InfoSec happenings, and to discuss the rising utility of the bug bounty programs she’s credited for popularizing.
Dave Shackleford (@daveshackleford) is the founder and principal consultant of Voodoo Security, a firm that takes a high-level analytical approach to security projects. As a SANS analyst and educator, Shackleford’s voice is authoritative in the InfoSec space. On Twitter, he links to security tech articles and case studies, while mixing in some lighthearted interaction with industry peers.
David Ulevitch (@davidu) is the founder and CEO of OpenDNS. OpenDNS adds essential protections to the Domain Name System and provides an enterprise security solution, Umbrella, that offers advanced intelligence and high-level visibility of activity across locales. On Twitter, Ulevitch shares cybersecurity news and funny tidbits as he converses with other InfoSec professionals.