Ben McCall started his academic career at the intersection of chemistry, astronomy, and physics, performing fundamental research on molecular spectroscopy and astrochemistry.  Over time, as he learned more about climate change, resource depletion, and other related challenges, he moved into the field of sustainability.  He served as the inaugural Associate Director for Campus Sustainability at the University of Illinois at Urbana-Champaign, and then as the inaugural Executive Director of the Hanley Sustainability Institute at the University of Dayton, where his current title is Professor of Sustainability.  Ben was the initiator of the Planetary Limits Academic Network, and his current research interests are centered around the biophysical limits that our finite planet imposes on the sustainability of human civilization.