Boston schools superintendent Cassellius expands investigation into unlicensed counseling sessions Laura Crimaldi The Great Divide is an investigative team that explores educational inequality in Boston and statewide. . Boston Public Schools Superintendent Brenda Cassellius announced Thursday afternoon that she is expanding the district’s investigation into the use of an unorthodox brand of group therapy by an outside contractor who supervised the prestigious Boston Student Advisory Council, citing “deeply painful stories” detailed in a new Globe report. “I was saddened and angered reading the deeply painful stories shared by current and former students in the press this morning. I will not tolerate any situation where any student feels they were mistreated or unheard,” Cassellius said in a statement released by her office.Inside the unlicensed counseling that led Boston students to allege emotional abuse