So it made sense for Lemann to move from the history of ETS to the history of affirmative action, as it affected higher education admissions.
They didn't focus on affirmative action at all. 
mnli hypothesis: They didn't focus on affirmative action at all.  premise: So it made sense for Lemann to move from the history of ETS to the history of affirmative action, as it affected higher education admissions.