Pierre Clastres (1934-1977) was a French anthropologist and ethnologist who in the wake of the events of May '68, helped overturn anthropological orthodoxy in the 1970s. His books include "Society Against the State" (1974) and "Chronicle of the Guayaki Indians" (1972). Eduardo Viveiros de Castro is a Brazilian anthropologist and a professor at the National Museum of the Federal University of Rio de Janeiro.