In 1986, he took the position of European information security manager at Digital Equipment. Then, he joined the security research and development team. In 1999, he went to Entrust Technologies as a PKI software editor. In 2003, Le Roux joined Computer Associates as a technology strategist.
He has co-authored three books on security, is a lecturer at ISEP (Paris Graduate Engineering School) and is a regular speaker at security conferences.