Authors:

The professor, instead of being the "sage on the stage," functions as a "guide on the side."

"From Sage on the Stage to Guide on the Side" by Alison King, published in "College Teaching", Volume 41, No. 1 (pp. 30-35), www.jstor.org. Winter 1993.
The professor, instead of being the sage on the stage, functions as a guide on the side.