 Critics noted that Rhee had no experience running a school system, and had not even been a principal.She had been highly recommended to Fenty, however, by Joel Klein, the chancellor of the New York City public schools.Rhee inherited a troubled system; there had been six school chiefs in the previous 10 years, students historically had below-average scores on standardized tests, and according to Rhee, only 8 percent of eighth graders were performing at grade level in mathematics.