Garnav was an actor, considered to be a master of his craft by the 2360s, and a proponent of method acting.
In 2366, Data had studied virtually every renowned acting master in order to improve his acting skills, and found himself "attracted" to Garnav, Constantin Stanislavsky and Stella Adler, describing them as his mentors. (TNG: "Devil's Due")
This character was only mentioned in dialogue.