Gillian Horvath was born in New York City and attended Yale University. She worked as a writer's assistant before selling freelance scripts to Quantum Leap, Xena: Warrior Princes, and the original Beverly Hills 90210. She has gone on to work as a writer and producer on a number of cult favorite sci-fi shows, ranging from Highlander and Forever Knight to Sanctuary and Primeval: New World. During her time on Highlander: The Series she supervised the tie-in novels and edited a book of tie-in fiction by the cast and crew. She also traveled extensively representing Highlander at fan conventions.