Michael E. Mackay, PhD, received his undergraduate degree in chemical engineering with distinction from the University of Delaware then worked for Procter and Gamble prior to attending graduate school at the University of Illinois (Urbana) where he received M.S. and PhD degrees in chemical engineering. He subsequently became a postdoctoral fellow at the University of Melbourne (Australia) and then has had academic positions at the University of Queensland (Australia), Stevens Institute of Technology, Michigan State University and is presently a Distinguished Professor in the departments of Materials Science & Engineering and Chemical & Biomolecular Engineering at the University of Delaware. He is an internationally known leader in polymer physics, characterization and processing and recently has used his expertise to understand and improve the additive manufacturing technique of material extrusion or what is commonly called 3D printing