Nikola Tesla - Serbian-American electrical engineer and inventor who patented an induction motor and also experimented x-rays, remote control, and numerous other devices. He built a Colorado Springs laboratory in 1899 to conducted experiments in wireless power transmission and communication. One of his large experimental coils there is used in the Shadow Fox: Sons of Liberty journal entry. This experiment is described in the book as the origin of Shadow Fox. The book also plays on something from Tesla lore called "The Wall of Light", envisioned as a way to travel through space and time. The Wall of Light is used to travel through time in the book.