Gordon Lyon (also known by his pseudonym Fyodor Vaskovich)[1] is an American network security expert,[2] creator of Nmap and author of books, websites, and technical papers about network security.

He is a founding member of the Honeynet Project and was Vice President of Computer Professionals for Social Responsibility.

Lyon has been active in the network security community since the mid-1990s.

In December 2011, Lyon published a post criticizing the fact that Download.com started bundling grayware with their installation managers and expressing concerns users confusing Download.com-offered content for software offered by original authors; his accusations included deception as well as copyright and trademark violation.

[6][7] Lyon maintains several network security web sites: