Mark Stefanski has 20 years of experience as a high school science teacher, and he currently teaches biology and holds the Henry David Thoreau Faculty Chair (for ecological understanding) at Marin Academy, an independent high school in San Rafael. Mark serves as a leader for Marin Academy’s Eco-Council, a group composed of students, faculty, staff, administrators, board members, parents, and outside experts that promotes a sustainable way of life within the school and surrounding community. He is a co-founder and co-chair of Marin Academy’s annual Conference on Democracy. Mark works as a consultant to the San Francisco Unified School District, providing professional development workshops for science teachers and tutorial sessions in advanced biology for public school students. Serving on the board of the California Science Teachers Association and on the California Teacher Advisory Council, Mark works to strengthen the quality of science education throughout the state.