Michael Duffy, MEd, is co-director of the Montessori Elementary Teacher Training Collaborative in Lexington, MA. He taught both Lower and Upper Elementary classes before becoming a full time Montessori teacher trainer. He is author or co-author of three books on Montessori including "Children of the Universe," "Math Works," and "Love of Learning." He and his wife, D'Neil, were honored as AMS Living Legacy recipients in 2018. AMS credentialed (Elementary I – II).