"TNTP Teaching Fellows" is a highly selective route to teacher certification that aims to prepare people to teach in high-need public schools. The program recruits professionals seeking to change careers and recent college graduates who are not certified teachers. "TNTP Teaching Fellows" expects its participants to teach for many years, but does not require them to make a minimum time commitment to teaching. Program participants complete online coursework and receive 5-7 weeks of in-person training focused on foundational teaching skills during the summer before they begin teaching. They must demonstrate mastery of these core skills to be eligible to teach. They receive continued professional development and coaching from "TNTP Teaching Fellows" during their first year of teaching, and additional support provided by their schools and districts. As full-time employees of the public schools in which they work, new "TNTP Teaching Fellows" teachers receive the same salary and benefits as other beginning teachers in their school district. The What Works Clearinghouse (WWC) identified eight eligible studies that investigated the effects of "TNTP Teaching Fellows" on teacher and student outcomes. An additional 34 studies were identified but do not meet WWC eligibility criteria for review in this topic area. Citations for all 42 studies are in the References section. The WWC reviewed eight eligible studies against group design standards. One study is a randomized controlled trial that meets WWC group design standards without reservations. This report summarizes the study. The study included 4,116 middle and high school students in nine school districts in eight states. According to the WWC review, the extent of evidence for teachers trained through "TNTP Teaching Fellows" on the academic achievement of middle and high school students was small for one student outcome domain--mathematics achievement. The remaining seven studies do not meet WWC group design standards. Appendices include: (1) Research details for Clark et al. (2013); (2) Outcome measure for the mathematics achievement domain; (3) Findings included in the rating for the mathematics achievement domain; (4) Supplemental school level findings for the mathematics achievement domain; and (5) Supplemental teacher subgroup findings for the mathematics achievement domain. Contains WWC Rating Criteria and a glossary of terms.