Christy Carpenter, a former vice-chair of the board of directors of the Corporation for Public Broadcasting, is the new c.e.o. of the Winthrop Rockefeller Institute in Morrilton, Ark. Carpenter recently served as e.v.p. and c.o.o of the Paley Center for Media, overseeing operations in New York and Los Angeles, and is a member of the KCET Board of Directors. Carpenter was appointed by President Clinton in 1998 to the CPB Board.