Neurospora crassa
Upon his arrival at Stanford, he began a collaboration with Edward Tatum, who had been working with "Neurospora crassa" since 1941 in collaboration with George Beadle. In this way, he was connected to the very earliest research with Neurospora. Throughout his career, he continued to work with "Neurospora crassa", which he often championed as a model organism. At the time that he died in 2007, a substantial percentage of all researchers in the world who were working with "Neurospora crassa" had either trained with or collaborated with Perkins or one of his students or associates.