Stephen F. Ferrari is a Professor of Zoology in the Biology department of the Federal University of Sergipe, Sao Cristovao, Brazil. While his research covers a wide variety of mammalian taxa, he has a particular focus on the primate genera Callicebus and Chiropotes, their ecology and conservation.

Adrian Barnett is an Honorary Research Fellow at the Instituto National de Pesquisas da Amazonas in Manaus, Brazil, and at the Centre for Research in Evolutionary and Environmental Anthropology at Roehampton University. He is a tropical biologist whose research focuses on rare, little-known and hard-to-find species and has spent fifteen years studying tropical primates, particularly the conservation and ecology of uacaris.

Liza M. Veiga is a postdoctoral fellow at the Federal University of Para and the Emilio Goeldi Museum, both in Belem, Brazil. Her research focuses on the conservation biology of the genus Chiropotes, Brazil.