SANS Instructors

Jaime Geiger is an experienced forward and reverse engineer with a passion for teaching. He currently works in the DC area, where he perfects software design and implementation, reverse engineering, exploit development, and network administration.

Charles “Charlie” Goldner is a Senior Technical Engineer at Counter Hack. With over two decades of experience working for SANS, the U.S. Army, and the Nevada National Guard, he brings a wealth of public and private sector expertise to the classroom.

Jon Gorenflo has strengthened cybersecurity through leadership in pen testing, incident response, and security engineering. His dedication to mentoring and knowledge-sharing has empowered professionals and enhanced defenses industry-wide.

Rich is a seasoned cybersecurity professional with over two decades of experience in the cyber domain. He has participated in offensive and defensive cyber operations for the Department of Defense (DoD) in more than 17 countries.

Marcus Guevara is a Texas native and the author of the philosophical book "Hacking Theology". He holds a bachelor's degree in Computer Science and a master's degree in Cybersecurity.

Phil Hagen shaped network forensics with SOF-ELK® and SANS FOR572, setting standards in large-scale log analysis and response. His role in exposing a global fraud ring behind hundreds of millions in losses defines his lasting impact on cybersecurity.

Ron is a retired US Air Force officer and enlisted person with over 30 years of experience in information technology and information assurance, from software development and system administration to security analysis and security operations.

Adam Harrison has 15 years of experience in Digital Forensics and Incident Response, the last 10 of which have focused on helping organisations prepare for, prevent and respond to cybersecurity incidents.

Shane Harsch is an information security professional with over 25 years of experience ranging from military to manufacturing to security consulting and professional services.

Ken owns Lucid Truth Technologies, a private investigation agency and forensic consulting firm specializing in computer, mobile, network, and cloud forensics. Ken’s mission is to “make the truth clear,” and that's reflected in his teaching style.

Satoshi Hayashi started his information security career at a major telecommunications company and then joined the Metropolitan Police Department as a computer crime special investigator before returning to telecom.

David is a security consultant with 20+ years of experience in vulnerability management, application security, cloud security, and DevOps, a co-author of LDR516: Building and Leading Vulnerability Management Programs, as well as an instructor for SEC540: Cloud Security and DevSecOps Automation.