He writes the series of novels featuring hacker John Fagan, aka phr33k, and FBI agent Jeannie Reese.
[1] While finding work in this capacity in New York City, Henderson started writing technical documentation for the medical industry, requiring him to perform a great deal of research into the topics discussed.
[1] Henderson has stated that he put in "nearly a year of research and fact-finding" before starting to write his first novel, Maximum Impact (known as Circumference of Darkness in the US).
[1] He has since written a follow-up novel, Seven Seconds, and ghost-wrote the book The Overton Window for political commentator Glenn Beck.
[2] The Overton Window contains marked similarities to Circumference of Darkness.