Jack Truman stands at five foot nine inches and weighs 160 pounds. He has blond hair and blue eyes. Truman was born on Earth in the heart of Chicago, Illinois. In Chicago, he lived with his Aunt Gloria and Uncle Walt after the death of his parents in a hover tram accident when he was twelve. Not making many friends as a child, Truman did show an interest in discovering how mechanical equipment worked and how it was built.

Under his uncle's instruction, Truman learnt how to make and assemble different pieces of equipment such as replicators and small anti-gravity units. Over the course of a few weeks, he was able to build a small sublight shuttle.

At the age of eighteen, Truman wanted to expand his knowledge of mechanics and electronics. After much discussion with his aunt and uncle, he joined Starfleet. There he met future Marine Robbie Gleason. The two attended the Academy together, Truman taking Engineering classes, whilst Gleason went off to learn medicine. The two became room-mates during their second year and enjoyed going to the Academy lounge and playing pool. After their graduation, the two friends were separated, for what they thought would be forever.

Truman was assigned to the USS Missouri, a Nebula class starship which was assigned to explore deep space. Gleason was to have been assigned to the USS Voyager, an Intrepid class starship. However, his transfer didn't come through in time and Gleason was lucky to escape the 'tragedy' of what happened to Voyager.

He was instead assigned to the USS Venture, a Galaxy class starship assigned to patrol the inner Alpha Quadrant.

As time passed on the Missouri, Truman became an accomplished engineer inside his team. After six months on the Missouri, Truman would be transferred to Starfleet R and D at the advisory of his CO. Truman participated in a few projects, such as the introduction of the pulse emitter phaser rifles and enhanced pulse-flux inhibitors.

After serving for six months at Starfleet R and D, he was transferred again aboard the newly commissioned USS Leviathan as an engineer, It was hoped that his time with R & D would be of value to the vessel and it's new Quantum Slipstream drive.

Now aboard the Leviathan, Truman was re-united with his friend Gleason again. When Captain Jon Phanan was rescued from the USS Utopia and started to seek out possible Marine recruits, both Truman and Gleason volunteered.

Robbie Gleason was killed during a collision between the USS Leviathan and another vessel whilst attempting to pass through an inter-dimesional wormhole. Almost a third of the Marines serving aboard the Leviathan were killed, a fact that Jack has found hard to accept.

He returned to Earth along with Major Phanan and assisted in the selection and recruitment of a new batch of Marines to serve aboard the Leviathan. Jack now serves as the Marine squad technician, maintaining all the Marine equipment aboard the Leviathan, including the Mustang class runabout the Devastator II.