Luebbert worked at Microsoft as one of the developers of Microsoft Word (1984-1997). He served on the Macintosh Word team with Charles Simonyi for five years (1984-1989).
He is the webmaster of the SongTrellis website (http://www.songtrellis.com) and is the author of the SongTrellis Music Editor, a music editing application which runs on the Macintosh operating system.