There is a need for supporting our graduate students in learning how to teach science in higher education and over the next two years, we propose developing and implementing an innovative, interdisciplinary 1-credit teaching seminar course for graduate students in chemistry, astronomy, physics, and biology. We will collaborate across our departments and with universities who have successful teacher preparation programs for graduate students to develop the course. We propose the course will include relevant theory and pedagogy for science instruction as well as opportunities for teaching, peer observation, and reflection. Data collected from the first iteration of the course (fall 2016) will provide evidence of success but also identify areas in which we can improve in the second iteration (fall 2017). Our course will impact the instruction of ~100 graduate students each year, who teach 400-1400 undergraduates in each department per year at UVA. We will share project results across UVA and other universities.