Jaime Escalante was the greatest American math teacher of the 20th century. He prepared public high school students in Los Angeles for the Advanced Placement test in mathematics; see "Stand and Deliver".
Conventional pedagogical wisdom holds that the poor, the disadvantaged, and the "culturally different" are a fragile lot, and that the academic rigor usually found only in elite suburban or private schools would frustrate them, crushing their self-esteem. The teachers and administrators that I interviewed did not find this to be true of Garfield students.
If a team begins losing after a coach is replaced, sports fans are outraged. The decline of Garfield's math program, however, went largely unnoticed.