Roark Grant Critchlow (born May 11, 1963) is a Canadian actor, best known for appearing on the daytime US soap opera Days of our Lives from 1994 to 1999 as Dr. Mike Horton. He also had a recurring role on the soap Passions. More recently he was in the TV movie The Perfect Husband: The Laci Peterson Story as well as appearing in the Nickelodeon series Drake & Josh as Dr. Glazer. He also portrayed Jamie Lynn Spears's father in Zoey 101. Roark has had smaller roles in movies like Mr. Deeds with Adam Sandler and TV shows such as Malcolm in the Middle, Entourage, Charmed, Highlander: The Series, Afterworld and Friends. In 2009, he appeared in an episode of the re-imagined Battlestar Galactica. He also appeared in the 2009 movie "Hydra" as Sean Trotta. Critchlow recently had a recurring role on the science fiction TV show V and on ABC Family's breakout-hit "Pretty Little Liars", where he has the role as Tom Marin (Hanna Marin's father).