Last Wednesday, the office of New York City Mayor, Bill de Blasio, announced that Miami-Dade School Superintendent, Alberto Carvalho, would be the new chancellor of New York City’s school system, and that Carvalho would be in New York City the following day for a formal announcement. On Thursday, Carvalho was still in Miami. He then stunned New York City officials when, during the course of a televised Miami school board meeting, Carvalho disappeared twice, finally returning to announce that, af…