|Harold McGraw will head up McGraw-Hill Markets, effectively ending his family’s management of the textbook business. (Bloomberg News)|
Under pressure from investors, McGraw-Hill Cos. chief executive Harold “Terry’’ McGraw III decided to break up the business founded by his great-grandfather in 1888. As CEO, McGraw turned the Standard & Poor’s unit into the company’s most profitable business. But after losing 41 percent of its value since 2006, McGraw-Hill will split into two companies - one focused on education, the other on financial ratings and data.