The USNC/MI, a standing committee of the National Academies of Sciences, Engineering, and Medicine, planned a workshop at which U.S. and Finnish mathematics educators could exchange information and ideas about the preparation of new mathematics teachers and the means of providing them with support and professional development throughout their careers. While this is not the first time U.S. and Finnish mathematics educators have discussed educational practices, this workshop focused primarily on teacher development in both nations in the context of mathematics education.