Jeff Mesnil is a core R&D developer a JBoss, the middleware division of Red Hat and works on HornetQ, the next-generation messaging system.
He received a French MS in applied Mathematics and Software Engineering and an English MSc in Applied Mathematics and Software Engineering and has designed and developed middleware systems for labs and companies such as INRIA, Kelkoo, Continuent and now Red Hat.
Jeff is a strong proponent of Open Source development and collaborative processes. He also maintains a set of personal Open Source projects in addition to its day job.
You can read more from Jeff at his weblog: http://jmesnil.net/weblog/