ITHACA, N.Y. - Urie Bronfenbrenner, a Cornell University psychologist who pioneered an interdisciplinary approach to the study of child development and helped create the federal Head Start program, has died. He was 88. Bronfenbrenner, a member of the Cornell faculty since 1948, died at his home Sunday from complications from diabetes, the school announced Monday. The Russian-born Bronfenbrenner was credited with creating the interdisciplinary field of human ecology and was widely regarded as one of the world's leading scholars in developmental psychology and child-rearing. Before Bronfenbrenner, child psychologists studied the child, sociologists examined the family, anthropologists the society, economists the...