Josselyn then moved to Toronto to complete her PhD in psychology and neuroscience at the University of Toronto.[1] Under the mentorship of Dr. Franco Vaccarino, Josselyn studied the effects of CCKB and CCKA modulation on associative learning and published multiple first author papers.[6][7][8] Following her PhD, Josselyn completed her postdoctoral work at Yale University in New Haven under the mentorship of Dr. Mike Davis.[9] Shortly after, she moved to LA to complete another postdoc under the mentorship of Dr. Alcino J. Silva at the University of California Los Angeles.[3] Josselyn helped discover the importance of CREB in memory formation and retrieval[10] which led to probing the molecular mechanisms and biological purpose of forgetting.[11]