Nathan is the author of the bestselling technothriller series The Fifth Column, which includes The Chimera Vector, The Seraphim Sequence and The Phoenix Variant. In his spare time he practices lock picking and discovers hidden places around the world with urban explorers. He studies Systema, a little-known martial art and former secret of Russian special forces. Nathan has trained under USMC, SEAL team, Spetsnaz and Defence Intelligence instructors, and the wilderness and tracking skills of the Chiricahua Apache scouts and Australian Aboriginals. He also drinks tea.