[1][4][5] Grier is a frequent speaker at computer conferences such as Black Hat, ACSAC, and DFRWS.
[1][2][5] His work has been cited by Microsoft Press, IBM Internet Security Systems, Hewlett-Packard, SC Magazine and the FBI National Infrastructure Protection Center.
[4][10][11][12][13][14][15] Grier is an advisor to private clients in computer security, software development and information technology,[4] and conducts training in computer security and forensics for private clients and the Department of Defense Cyber Crime Center.
[5] In 2001, Grier exposed several security flaws in a number of techniques then popular in Common Gateway Interface web applications.
[17] Grier is a member of the Association of Orthodox Jewish Scientists, where he lectures on the intersection of Halakha with computer science and physics.