The New York Times just posted an obituary of Theodore R. Sizer, founder of the Coalition of Essential Schools, who reportedly died yesterday at his home in Massachusetts.Writes Times reporter Margalit Fox:Sizer was best known as the father of the Essential Schools movement, which he founded in 1984. The movement's umbrella organization, the Coalition of Essential Schools, spans a diverse array of public and private schools united by their adherence to a set of common principles.The principles h