This study examined teachers' and administrators' attitudes toward professional development at an international school. It found that administrators had significantly more positive views of professional development than teachers. Additionally, teachers' attitudes were not impacted by years of experience or other demographic factors. Teachers reported that individual impactful professional development experiences had a large influence on their teaching. The study concluded that professional development is most effective when it is relevant, practical, and builds on teachers' experiences. It recommends school leaders involve teachers in planning, and structure opportunities for teachers to learn from each other and reflect on their practice.