From Wikipedia, the free encyclopedia. Derek Magyar is an American actor of Hungarian origin. He is best known as the director and producer of the film "Flying Lessons", as the lead character "X" in the film "Boy Culture", and as Commander Kelby during the fourth season of Star Trek Enterprise He graduated from the California Institute of the Arts in 2003 and has appeared in several TV shows and movies. In 2005 he was cast in the role of Commander Kelby, the newly-promoted Chief engineer of the starship Enterprise in the TV Series "Star Trek Enterprise". In 2006 he had his first starring role as "X" in the LGBT film "Boy Culture" opposite Patrick Bauchau, Darryl Stephens, and Jonathon Trent. He used to date actress and singer Taryn Manning.