Dr. Christian Messier is a professor of Forest Ecology and Urban Forestry and scientific director at ISFORT at the University of Quebec, in Canada (UQO and UQAM). He obtained his PhD from the University of British Columbia (UBC) in 1991 and did a Post-doc at the University of Helsinki in Finland in 1991/1992. His research interests are wide, ranging from the basic understanding of tree growth and death, forest community and ecosystem functioning to decision-making tools to better manage and conserve natural and urban forests. In 2005, he started an ambitious research project to manage a large forest unit (850 000 ha) based on the principle of functional zoning (TRIAD) in central Quebec, Canada. He has established a world-wide network of diversity experimental tree plantation (IDENT) to study the relationships between tree diversity and ecosystem functioning with sites in Canada, USA, Germany and Italy. He has published more than 300 referee papers, reports, book chapters and books. He holds an industrial-NSERC research Chair on tree growth since 2010 and a Canada Research Chair on the resilience of managed forest to global change since 2017.