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Using a series of equations, Kosinski was able to make a measurable increase in propulsion with the starships USS Ajax and USS Fearless. His warp drive efficiency upgrade experiments brought him to the USS Enterprise-D in 2364, where he was to test different ways of entering warp speed and different intermix ratios. It later was revealed that it was his mysterious assistant, The Traveler, who was affecting the upgrades and not him. (TNG episode: "Where No One Has Gone Before")