Herbert L. Strock
Other directorial efforts included "Blood of Dracula" ( a 1957 film in which a disturbed teenage girl at a boarding school becomes a vampire through hypnosis ) and Ivan Tors' "Office of Scientific Investigation" trilogy , which included "The Magnetic Monster" , "Riders to the Stars" and "Gog" , shot in 3-D . 
<triplet> Blood of Dracula <subj> 1957 <obj> publication date