1) Psychologist 2) Robert mearns yerkes 3) Wisconsin observatory 
[crater] Yerkes is a lunar crater near the western edge of Mare Crisium. In the past the interior of this crater has been almost completely inundated by lava, leaving only a shallow remnant of a rim above the mare. The rim is widest on the western and southern portions, and barely existent to the east, forming a thin curve in the surface. A...
[n] - United States psychologist who studied the intelligence of primates (1876-1956)
Robert M. Yerkes noun United States psychologist who studied the intelligence of primates (1876-1956)
1837–1905, U.S. financier and mass-transit magnate. · 1876–1956, U.S. psychologist and psychobiologist: pioneered in studies of the great apes.