Excellent mathematics teachers establish learning environments that encourage students to actively engage with mathematics and foster co-operative and collaborative learning. Whiteboarding, using an erasable surface on which to work and share ideas, has been shown to increase student engagement, collaboration, and higher-order thinking. We report on one teacher's experiences as she introduces whiteboarding into her secondary mathematics classroom. The teacher reports increased student confidence and collaboration and we see a shift in her focus from concerns about classroom management, to a passionate recommendation to use whiteboarding in mathematics instruction.