sentences:  After attending Hudson River Military Academy, Seiter broke into films in 1915 as a bit player at Mack Sennett's Keystone Studios, doubling as a cowboy.He graduated to director in 1918.At Universal Studios in the mid-1920s, Seiter was principal director of the popular Reginald Denny vehicles, most of which co-starred Seiter's then wife Laura La Plante (his second wife was actress Marian Nixon).