Ivan Ristić is a security researcher, engineer, and author, known especially for his contributions to the web application firewall field and development of ModSecurity, an open source web application firewall, and for his SSL/TLS and PKI research, tools and guides published on the SSL Labs web site.

He is the author of two books, Apache Security and ModSecurity Handbook, which he publishes via Feisty Duck, his own platform for continuous writing and publishing. Ivan is an active participant in the security community and you'll often find him speaking at security conferences such as Black Hat, RSA, OWASP AppSec, and others. His latest project, Hardenize, is a security posture analysis service that makes security fun again.