This exploratory study investigates the relationship between teachers' continuing professional development (CPD) and their beliefs about learning and teaching, in a Dutch secondary education context. Two hundred sixty teachers participated in a survey focused on teachers' updating, reflective, and collaborative activities, as well as their student- and subject matter-oriented beliefs. A cluster analysis produced three distinctive CPD profiles, reflecting relatively low, medium, and high participation in the three CPD activities. The greater teachers' participation in CPD, the more student oriented those teachers are. These findings have strong implications for fostering teachers' participation in CPD and encouraging their student orientation. (Contains 2 figures and 7 tables.)