Gretchen M. Spreitzer is the Keith E. and Valerie J. Alessi Professor of Business Administration at the Ross School of Business, where she is codirector of the Center for Positive ...visualizza altroGretchen M. Spreitzer is the Keith E. and Valerie J. Alessi Professor of Business Administration at the Ross School of Business, where she is codirector of the Center for Positive Organizations.visualizza meno