He was hired by Rahm to run the charter school wing of the mayor's school-closing operation. You know how that goes -- close a neighborhood public school, claiming it's "underutilized" and then open 3 charter schools around the corner, run by private companies. It's an economic and political win-win for the mayor and the corporate guys. And Sicat was the guy brought in to make it work.
Rahm even invented a new position of chief portfolio officer specifically for his rising star bureaucrat. So why is he leaving a position created just for him? Don't know. Rahm likes to keep the revolving door revolving. It keeps any one department from getting too much power. Plus he's had to make room in the bloated school-closing/charter bureaucracy for new blood, like ex-marine colonel and hostage negotiator, Tom Tyrell and for Ald. O'Connor's sister, Catherine Sugrue.
Much like the military-industrial complex, where operators slide easily from the government bureaucracy to corporate board rooms, so it is with the edreform-corporate complex.
******One group that sticks around is the corporate patrons of charter schools themselves who also keep Rahm on a short leash.
From the Chicago Tribune:
Yet the mayor's kitchen cabinet of advisers includes political donors from the strata of high finance in which he himself made millions of dollars. Those advisers, many active in promoting charter schools, include Michael Sacks, the CEO of Grosvenor Capital Management, who also heads Emanuel's World Business Chicago economic development panel; Kenneth Griffin and his wife, Anne Dias Griffin, who each run hedge fund firms; and venture capitalist Bruce Rauner, a likely candidate for the Republican governor nomination.