Solomon "Sol" Epstein was the inventor of the Epstein Drive, a modified fusion drive.
A Jewish man born on Mars, Epstein was an engine engineer for Masstech for at least a decade before he started spending his free time implementing his design for a magnetic coil exhaust acceleration to increase drive efficiency, enabling spaceships to sustain thrust throughout the entire voyage.
After finishing his design, Epstein outfitted his private three-man yacht with the Epstein drive and turned it on, launching it out into the Sol system at a marginal percentage of the speed of light. He was, however, unable to turn the engine off, and never returned. His ship accelerated for 37 hours at an unknown rate above 7 g before his fuel supply ran out and ended up at about 5% the speed of light. Solomon himself died from the high acceleration within minutes.