Henry joined IronPort Systems in 2006 as one of the original engineers responsible for IronPort Anti-Spam (TM), the industry's most accurate anti-spam filter, and invented IronPort's Multidimensional Pattern

Recognition (TM) technology for combatting image threats. Henry has been involved in the anti-spam community since 2003, serving as a committer for the Apache SpamAssassin project and a contributor to both the SURBL and URIBL spam domain name blocklists.

More recently, Henry's focus has been on the nexus of malware and crime. Henry is a frequent speaker at both industry and academic computer security conferences and regularly engages in public-private partnerships with law enforcement to help bring online criminals to justice.

Henry won best paper at the MIT Spam Conference 2009 for "The Rise and Fall

of Reactor Mailer."