 Among the regular guests on "The Lab" were tech personalities Steve Gibson, Alex Lindsay, Chris Pirillo, and Andy Walker.Walker, along with Amber MacArthur, was Laporte's co-host on the Toronto-based "Call for Help"; Pirillo was the show's host for part of its earlier U.S.-based run.Members of Vancouver's technology community, such as Rick Yaeger and Kris Krug, became regular guests on The Lab.