CIRCE has six leading scientists as international associates:

• professor Robert E. Ricklefs, University of Missouri - personal website
• professor Jordi Bascompte, Estación Biológica de Doñana, a Center of the Spanish Research Council (CSIC) - personal website
• professor Rick Condit, Smithsonian Tropical Research Institute (STRI) 
• professor Brian J. Enquist, University of Arizona  - personal website
• professor Luc De Meester, Katholieke Universiteit Leuven - personal website
• professor Richard M. Sibly, University of Reading - personal website

Further CIRCE collaboration:

• Joseph Chipperfield (University of Bergen)
• Denali National Park
• Toke Høye
• Niels-Martin Schmidt
• Carl Sayer (UCL)
• Nigel Wilby (Stirling University)
• Beth Okamura (Natural History Museum, London)