As generalists first, we are, as Sizer noted, engaged in the process of teaching kids to “use their minds well.” This does not preclude being thoroughly versed in one or more subject areas, even in imagining—in partnership with our students—new and trans-disciplinary subject areas. We too, have an imperative to “use our minds well.” As we fearlessly invoke our own prior knowledge and deeply held understandings in order to challenge and disrupt them, we ask ourselves fundamental questions—what is school, homework, rigor? Why do they matter? Do they matter?—we are reinventing schools and reinventing ourselves. We are thinking like teachers.