Diesel Technology of Chattanooga is owned and operated by Jonathan Ryan aka Swamp or Swamp Donkey, co-founder and head of R&D at Swamp's Diesel Performance from 2003 to 2018.

Among other projects there, he completely reverse engineered the circuit boards for the 7.3 IDM, 7.3 PCM, and the 6.0 FICM, invented the Swamp's HVHF IDM (Hi-Voltage Hi-Frequency) and the Heavy Duty 58 Volt FICM, also called a Cold Weather FICM or Winter FICM or whatever other names other companies have come up with to try and distinguish their products ;) He also laid the foundation for all of Swamp's custom tuning on 7.3 Powerstrokes and tuning the 1999 and newer trucks to run single-shot injectors, designed the dyno test cell, ran the engine dyno and did all the dyno tuning and testing.

Phreaknic 21 Presentation on Reverse Engineering Printed Circuit Boards

 He now concentrates on electronic module repair, working from his home shop near Chattanooga, Tennessee, goes whitewater kayaking on the Ocoee river after work, and teaches Swift Water Rescue classes to firefighters, police and rescue squads from all over Tennessee on the weekends. :D