(Jack Martin speaks after being named the Detroit Public Schools' newest emergency manager by Governor Rick Snyder at Davison Elementary-Middle School Auditorium in Detroit on July 15.) Michigan’s governor on July 15 appointed a seasoned financial guru to run Detroit’s ailing public school district, a move that many observers hailed as a saving grace for the city's classrooms in decline. Three days later, Detroit filed for bankruptcy. Jack Martin, who took office as emergency manager for Detroit Public Schools last Monday, is now tasked with overhauling Motown's rusting educational system during a period of economic calamity. Roy Roberts, Martin’s...