A retired member of the US Marine Corps and US Army Special Forces, David Diaz has worked and trained with elite military professionals on six continents. With thirty-five years of experience teaching human Tracking and Anti- and Counter-Tracking tactics and techniques in deserts, jungles, and mountains and on the urban streets, Diaz has a unique skill set that bolsters conventional and special operational units in the United States.
Diaz has also trained elements of various allied and NATO troops. Diaz is recognized throughout the military, law enforcement, and commercial industries as a subject-matter expert in the theory and practice of human Tracking.
His first book, Tracking: Signs of Man, Signs of Hope, originally published by Lyons Press in 2005, is considered a seminal manual in the field of human Tracking.The second edition's title was changed to Tracking Humans. This addition has more details.