Ingrid taught for many years in the Biology Department at the University of Pennsylvania. Currently, she teaches K-12 teachers in a variety of professional development settings. Her teaching emphasizes actively engaging students in order to foster understanding of important biological concepts. She and her colleagues have developed multiple minds-on activities for teaching biology and scientific thinking to middle school and high school students, as well as students in college-level biology courses for non-majors. These activities include both hands-on activities (available at http://serendip.brynmawr.edu/sci_edu/waldron/) and discussion/worksheet activities (available at http://serendip.brynmawr.edu/exchange/bioactivities).