David is the Director of VALID; a non-profit delivering training and guidance in tree risk-benefit assessment and management. Before setting up VALID, for more than a decade, David was one of the lead Quantified Tree Risk Assessment (QTRA) trainers, and an invaluable contributor to QTRA’s past development. He is currently dipping his toes back into the academic stream by undertaking a PhD into tree risk and likelihood of failure decision-making.