He was signed by the Thanhouser Company based in New Rochelle, New York in 1912, moving to American Film Studios a year or two later, and starred in about 200 films until 1929.
Harry Potter | Johann Wolfgang von Goethe | Harry S. Truman | Otto von Bismarck | Harry Belafonte | Harry Turtledove | Alexander von Humboldt | Wernher von Braun | Carl Maria von Weber | Herbert von Karajan | Gebhard Leberecht von Blücher | Debbie Harry | John von Neumann | Lars von Trier | Harry Reid | Harry Nilsson | Prince Harry | Harry Houdini | Harry Hill | Harry | Ferdinand von Mueller | Paul von Hindenburg | Alexander von Humboldt Foundation | Heinrich von Kleist | Harry Chapin | Anne Sofie von Otter | Harry Secombe | Erich von Stroheim | Max von Sydow | Justus von Liebig |
McMackin directed at over seventy-three films between 1912 and 1916 directing films such as When Empty Hearts Are Filled and the The Altar of Ambition in 1915 working with actors such as Harry von Meter, Louise Lester, Vivian Rich and David Lythgoe.
The Widow's Investment is a 1914 American silent short drama film starring Charlotte Burton, Sydney Ayres, Jack Richardson, Perry Banks, Edith Borella, Caroline Cooke, Vivian Rich, and Harry Van Meter.