Jon David is Risk Manager at Lehman Brothers, where he started as an officer in their Information Infrastructure/Security Engineering group.  With over 30 years in the field, he was a pioneer in both computer and network security.  Prior to Lehman Brothers, he was Director of Network Security for an ISP, and spent a depressingly long time as a security consultant.  He is a frequent author and speaker, and has repeatedly been in the van of security technology. He did his undergraduate work at Queens College and his graduate work at Columbia University.