Svenson began by writing Hardy Boys volumes #’s 28, 29, and 30, based on outlines by Harriet Adams. His first Hardy Boys book was “The Sign of the Crooked Arrow," published in 1949. He quickly advanced to work on other series, and on all aspects of production — providing plot outlines, writing complete manuscripts, editing, and rewriting works produced by other Syndicate authors. By 1961, Svenson had become such a key component to the ongoing success of the Syndicate, that he was made a full partner.