Theoretical Propulsion Group

From Memory Alpha, the free Star Trek reference.

The Theoretical Propulsion Group was an advanced engineering group working from Mars Station at the Utopia Planitia Fleet Yards in the 24th century. The TPG had extensive design input on the engines of the Galaxy-class starship.

Leah Brahms, who worked on the project during the design of the Galaxy-class as a junior member, was the team leader of the project in 2367. (TNG: "Booby Trap")