Former Columbia University president Katrina Armstrong will return to her role as CEO of Columbia’s medical center in June, according to people familiar with the matter, just a month after going on sabbatical "to spend time with her family" in the wake of a disastrous deposition in which she said she could not recall in detail a single anti-Semitic incident on campus. At a deposition conducted by the White House’s anti-Semitism task force in April, Armstrong said that she had " no specific