He performed with several theater companies, including The Complex, West Bank Cafe (where he also created original characters), SoHo Repertory, The (Samuel) Beckett Theatre and The Actors Factory. He wrote the screenplay Yo Yo Boy and created characters for stand up comedies in New York and Los Angeles. He lived in L.A. for three years, from 1993 to 1996, where he pursued acting in theatre (at The Complex) and wrote a one-man show.
He auditioned in Los Angeles for Gene Roddenberry's Earth: Final Conflict with Lisa Howard for Jonas McCord (executive Producer and writer), then met Paul Gertz (also executive Producer writer). They were both pleased with his performance. He joined the cast in the second season (1998) as Liam Kincaid (a human-Kimera hybrid), replacing Kevin Kilner as the lead actor. This is the role for which he is most famous. After two seasons in the series, Leeshock was comfortable in his role but found playing a lead character exhaustive and a huge responsibility. He was released from the series as a Business decision to minimize production costs; television producers pay less tax when they use Canadian actors. He left after the fourth season to return for the series finale in season 5.
Besides being an actor, a Writer and a Producer, Leeshock works as a professional Photographer from his studio (Robert Leeshock Photography, established in June 2009) in New York and New Jersey creating projects for film and television. He specializes in family portraits, weddings, events, actors' headshots and commercial print.
He's also an excellent athlete (he played lacrosse for Cornell), salsa Dancer and singer. He currently lives in New York, has one brother and three sisters. His girlfriend is Jacquelyn Mavrookas. They met in 2010.
With Richard Cranor, he founded Titan Sky Entertainment in March 2012. Leeshock (executive Producer and writer), Richard Cranor (writer, Producer and director) and Kiki Yeung (actress and producer) attended The American Film Market (AFM) in November 2013. They presented GodMachine and other projects.