(Leah Hogsten | The Salt Lake Tribune) Stanford University professor Susanna Loeb said her research has found that when half the grade-level teachers at a school were replaced, the performance of students in that grade dropped by the equivalent of missing a month of school. Loeb was part of a panel on teacher turnover, sponsored by the advocacy group Voices for Utah Children at the Capitol Thursday, Feb. 22, 2018. In Utah, and around the nation, school administrators report struggling with a personnel shortage as teachers leave the profession in large numbers and fewer individuals pursue careers in education.