Allan Liska has more than 15 years of experience in the world of information security. Mr. Liska has worked both as a security practitioner and an ethical hacker, so he is familiar with both sides of the security aisle and, through his work at Symantec and iSIGHT Partners, has helped countless organizations improve their security posture using more effective intelligence. In addition to security experience, Mr. Liska also authored the book The Practice of Network Security and contributed the security-focused chapters to The Apache Administrators Handbook.