Carla C. Johnson is a Professor of Science Education and Office of Research and Innovation Faculty Research Fellow at North Carolina State University, North Carolina, USA.

Janet B. Walton is a Senior Research Scholar at North Carolina State University's College of Education in Raleigh, North Carolina, USA.

Erin E. Peters-Burton is the Donna R. and David E. Sterling Endowed Professor in Science Education at George Mason University in Fairfax, Virginia, USA.