Gregg has contributed to the following published works:
- CISSP Exam Cram Questions 2nd edition Que Publishing ISBN 978-0789738073
- CISSP Exam Cram Que 2nd edition Publishing ISBN 978-0789738066
- CISSP Exam Cram Que 1st edition Publishing ISBN 978-0789734464
- Inside Network Security Assessment Sams Publishing ISBN 978-0672328091
- Certified Ethical Hacker Exam Prep Que Publishing ISBN 978-0789735317
- Hack the Stack Syngress Publishing ISBN 978-1597491099
- Syngress Force 2006 Emerging Threat Analysis: From Mischief to Malicious ISBN 978-1597490566
- Security Administrator Street Smarts 2nd edition Sybex ISBN 978-0470404850
- Security + Study Guide Syngress ISBN 978-1597491532
- CHFI Study Guide Syngress ISBN 978-1597491976
- InfoSecurity 2008 Threat Analysis Syngress ISBN 978-1597492249
- CompTIA Security+ Certification Kit ISBN 978-0470404867
- CISA Exam Prep Que ISBN 978-0789735737
- Build Your Own Security Lab Wiley ISBN 978-0470179864
Gregg has written articles for print and Internet publications such as:
- http://www.certmag.com/issues/dec02/feature_gregg.cfm
- http://gocertify.com/article/ceh.shtml
- http://searchnetworking.techtarget.com/generic/0,295582,sid7_gci1226646,00.html
- http://www.cramsession.com/articles/get-article.asp?aid=1084