Critical race theory (CRT) was used to frame a study of the impact of racial resegregation on students in a public school district. Racism operated in the district at multiple ontological levels -- such as interpersonal microaggressions, structural economic arrangements, and discursive processes. CRT provided a rationale for the interdisciplinary approach required to track these different manifestations of racism, while maintaining an emphasis on the material reality of racism. Having its origins in the field of law, however, CRT provided limited guidance for methodological decisions often required in a social scientific study. The author found posthumanist philosophy of science offered guidance for these decisions in a manner that complemented the philosophical and political commitments of CRT. This essay reflects on the advantages this combination of theories offers for the analysis of institutionalized racism. Illustrations are drawn from the study on school resegregation.