A second set of research papers showed how the life cycle generated residential moves and neighborhood outcomes.
[9][10] Throughout his career, Clark participated in many desegregation court cases studying the racial and ethnic separation patterns around the United States.
These studies were stimulated by a question posed by Lewis F. Powell Jr. in the Detroit desegregation litigation (Milliken v Bradley, 1974) – "how can we understand the patterns of ethnic and racial segregation in US cities.
Demographic research on the issues of residential segregation and selection was presented in these presentations: Armor v Nix (1979), Dowell (Oklahoma), Freeman v. Pitts (Georgia), Riddick (Norfolk Virginia), Jenkins (Kansas City), and Capacchione vs Charlotte-Mecklenburg (North Carolina).
[12] As the court reported in their review of Freeman v Pitts, “when residential segregation occurs as a result of private choices it is beyond the authority and also the ability of federal courts to address these private decisions and the impact of continuing and ongoing demographic changes.”[4] Clark was awarded a Fulbright fellowship in 1961 to study in the United States and later received the Honors Award of the Association of American Geographers in 1987.