Alison Jolly was the first scientist to study ringtailed lemurs in the wild, beginning in 1963. She continues her research on their troops in Berenty Reserve, working with many colleagues and students. Robert Sussman began the survey of ringtails throughout Wesern Madagascar in 1970, and in 1979 co-founded Beza Mahafaly Reserve of the School of Agronomy, University of Antananarivo. He has also continued research with generations of western and Malagasy students since then. Naoki Koyama heads the Kyoto University study group on ringtail behavior at Berenty, 1989 to the present. Hantanirina Rasamimanana of the Ecole Normale Superieur, University of Antananarivo, first worked at Berenty in 1983, and continues research there with the ENS students. In short, the four editors head all the major ringtail research groups, and have united with their colleagues and students to write this volume.