GeoCapabilities is a distinctive approach to teacher professional development which foregrounds the educational potential of geographical knowledge. This paper examines the effect of GeoCapabilities on geography teachers' expertise. First, the paper explores a problem of teacher training which privileges technique for classroom effectiveness over geographical thinking. We then introduce the GeoCapabilities 3 project, presenting and discussing findings through teachers' reflections. We argue that GeoCapabilities 3 offers a model of teacher development, which supports teachers as leaders of curriculum change in an 'activist profession'. This is needed if geography education is to equip young people with knowledge capabilities for their future.