In this year-long study of an academically low-performing, diverse, public elementary school in Wisconsin, I interviewed and observed teachers and school leadership to evaluate the effectiveness of race- and equity-focused teacher professional development on teacher practice. Results of the qualitative study were compared against quantitative data from the school's historic standardized assessment data. I found that while the school had made progress toward improving achievement scores and teachers' cultural responsiveness, the impact was not equitable across all subgroups, leaving room for future growth. Discussion includes several suggestions for future professional development at the school. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com.bibliotheek.ehb.be/en-US/products/dissertations/individuals.shtml.]