Mary Tyler Moore, PBS Pioneers of Television Published January 2, 2013 at 600 × 600 in Pioneers of Television Timeline Mary Tyler Moore is cast in ”The Dick Van Dyke show” as Laura Petrie. She lied about her age, fearing she was too young to get the part. Mary Tyler Moore is cast in ”The Dick Van Dyke show” as Laura Petrie. She lied about her age, fearing she was too young to get the part.