This case study examined the effects of a one-day differentiated instruction professional development on teacher implementation and student engagement. All schools provide professional development for teachers and expect student engagement in the classroom; how the training is structured, funded, and implemented is typically up to the school. The data collected focused on implementation of the differentiated instruction strategies presented, teacher views on differentiated instruction, and student engagement. Teacher surveys, teacher interviews, student surveys and classroom observations were used to determine impact of the one-day professional development on student engagement in the classroom.