This issue of The Progress of Education Reform summarizes recent research on the issue of teacher supply and demand, including: (1) An analysis of urban district hiring practices, and their effect on applicant attrition and teacher quality; (2) An examination of the role of teacher turnover in school staffing problems, and the extent to which school characteristics and organizational conditions contribute to teacher turnover; and (3) A report calling for increased federal leadership and investment in augmenting the capacity and performance of the nation's teaching force. The articles summarized in this issue are: (1) Wanted: A National Teacher Supply Policy for Education (Linda Darling-Hammond and Gary Sykes); (2) Missed Opportunities: How We Keep High-Quality Teachers Out of Urban Classrooms (Jessica Levin and Meredith Quinn) and (3) Teacher Turnover, Teacher Shortages and the Organization of Schools (Richard M. Ingersoll).