- Jacobs, J. K., Koellner, K., Seago, N., Garnier, H. & Wang, C. (2020). Professional development to support the learning and teaching of geometry: Examining the impact on teacher knowledge, instructional practice and student learning in two contexts. In P. Jenlink (Ed.), The Language of mathematics: How the teacher’s knowledge of mathematics affects instruction (pp.143-173). Lanham, MD: Rowman and Littlefield.*
- Seago, N., Koellner, K. & Jacobs, J. (2018). Video in the middle: Purposeful design of video-based mathematics professional development. Contemporary Issues in Technology and Teacher Education, 18(1), 29-49.*
- Jacobs, J., Seago, N. & Koellner, K. (2017). Preparing facilitators to use and adapt professional development materials productively. International Journal of STEM Education, 4(1), 30.*
This study will examine the impact of the Learning and Teaching Geometry (LTG) professional development for secondary mathematics teachers on the teachers' knowledge and classroom instruction, as well as on their students' learning. As the nation invests vast resources in the professional development of teachers to meet new curriculum and instruction challenges, exploring the efficacy of professional development is important to understand how best to direct those resources.