I work at the frontier between biological and environmental sciences, interfacing with global change. My major contributions to current debates have been in the study of forest dynamics, particularly carbon and water cycles. I worked in Boreal, temperate, tropical and Mediterranean forests in Europe, N and S America, Australia and Africa. I authored >200 peer-reviewed papers. I am very involved in international debates concerning how longer and more intense droughts, as a consequence of climate change, can accelerate tree mortality. I also work closely with the forestry sector on a range of themes including growth and carbon sequestration by forests using modelling, data assimilation and remote sensing.