Time will tell whether Martinez, who takes over later this month, is the right choice. In terms of experience, he’s an accountant, not an educator. His predecessor, Janice Jackson, was a teacher who, at the age of 27, founded her own school. Jackson steered CPS through some of its most trying crises — the Tribune’s “Betrayed” investigative series that uncovered the vast incidence of sexual violence against students; the 11-day teachers strike in fall 2019; and most recently, the pandemic-forced transition from in-class instruction to remote learning during the 2020-21 school year.