This study focused on how elementary teachers described their professional growth after being involved in lesson study in a professional learning community with other teachers and university professors. The study also examined how they described the impact the program had on their teaching of mathematics. The results indicated that the participants valued the collaboration within the community of learners. The sharing of ideas, planning lessons together, and reflecting on teaching and student learning in a supportive environment appears to have been critical to teacher growth. The authors conclude that the findings indicate that while involvement in professional development to deepen teachers’ understanding of mathematics and their knowledge of how to teach mathematics is important.