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Ivan Ristic is a web security specialist and the author of of ModSecurity, an open source intrusion detection and prevention engine for web applications. He is the founder of Thinking Stone, which offers products and services related to web application security. Ivan spends his time thinking about web application security, web intrusion detection, and security patterns. Prior to moving to the computer security field, Ivan spent a number of years working as a developer, system architect, and technical director in the software development industry.

Ivan wrote Apache Security for O'Reilly, a concise yet comprehensive web security guide for administrators, system architects, and programmers. An active participant in the web application security community, Ivan is a member of the Web Application Security Consortium, OASIS, and the PHP Security Consortium.