Poverty and Progress (Book)

Stephan Thernstrom, a Harvard history professor and author who, with his wife, the political scientist Abigail Thernstrom, vaulted to national prominence during the 1990s as a leading critic of affirmative action, died on Thursday in Arlington, Va. He was 90. His daughter, the author Melanie Thernstrom, said his death, at a care facility, was from…