Joffrey Czarny is a red team leader at Medallia, Security researcher and VoIP hacker at night, Ambassador of Happiness and Healthy Living. Since 2001, he is a pentester the red teamer who has released advisories and tools on VoIP Cisco products, Active Directory, and SAP and he has spoken at various security-focused conferences including Hack.lu, Troopers, ITunderground, Hacktivity, HITB, SSTIC, REcon, and Black Hat Arsenal.