Don Edward Beck
He is the co-author of the Spiral Dynamics theory , an evolutionary human development model adapted from the work of his mentor and colleague , developmental psychologist Clare W . Graves , Professor Emeritus in Psychology at Union College in New York , with whom he worked for over a decade . 
<triplet> Spiral Dynamics <subj> developmental psychologist <obj> part of <subj> Clare W. Graves <obj> author <triplet> Clare W. Graves <subj> Union College <obj> educated at