Leah Brahms was a female Human in the 24th century. She was a graduate of the Daystrom Institute, and in the late 2350s and 2360s, was a junior member at the Theoretical Propulsion Group at Utopia Planitia, where she was a member of the team that developed the Galaxy- and Nebula-class warp engines. (TNG episodes: "Booby Trap", "Galaxy's Child")
In 2369, Brahms reported for the TPG on their study of Dreman dilithium, saying adjustments to standard warp drive technology would be necessary to integrate the new variety of dilithium. (SCE eBook: Progress)
Sometime later, Brahms discovered that the Genesis Device technology was stolen. She survived the wave created due to an experiment with phase-shifting technology, but her husband died in the incident. Through her research, she was able to discover the source of the wave. After the crisis passed, La Forge admitted his love for her, but only asked her to meet him at an engineering conference a few months later. (TNG - The Genesis Wave novels: The Genesis Wave, Book 1, The Genesis Wave, Book 2)
As of 2382 Brahms was working with the Starfleet Corps of Engineers aboard the testbed starship USS Challenger alongside Captain Montgomery Scott. Together the two had transformed the base model Challenger into a highly advanced prototype starship in an effort to keep the Galaxy-class modern. During her time aboard the Challenger, Brahms would be reunited with Geordi La Forge and the two would restore their relationship during the Challenger's assigned to investigate trans-slipstream under the newly promoted La Forge. When the Challenger was destroyed in 2383, Brahms would agree to, temporarily, move in with La Forge aboard the USS Enterprise-E after he accepted his original position aboard that vessel to see how she felt about working on only one vessel instead of many. (TNG novel: Indistinguishable from Magic)
- In the anti-time future (2395) experienced by Starfleet captain Jean-Luc Picard, Geordi LaForge was married to a woman named Leah. It is implied, but not conclusively stated that this is Leah Brahms.