Stanley Teitel, the principal of Stuyvesant, will step down Sept. 1, the Education Department announced Friday afternoon. Officials provided few details on the resignation, but said a replacement would be named early next week. Meanwhile, summer school wrapped up this week. And the 24 schools ensnared in the turnaround fight between the unions and the city were told to focus on a smooth start in September. This, and a Twitter fight, in the weekly wrap up.

While they are duking it out with the city at the policy level, the public school unions are also hoping to kick it up on the political front, as part of a new coalition, New Yorkers for Great Public Schools, that plans to weigh in on the 2013 mayoral race. The group was formed to counter StudentsFirstNY, which has said it will inject $10 million a year, raised from hedge fund managers and venture capitalists, into the race to press for more policies like those adopted under Mayor Michael R. Bloomberg.

StudentsFirstNY, the new political group formed by leaders of the education reform movement like Joel I. Klein and Michelle Rhee, officially announced its arrival on Wednesday morning.

To counter the influence of the teachers’ union, powerful forces like Joel I. Klein, Michelle Rhee, Eva S. Moskowitz, Edward I. Koch and Geoffrey Canada, backed by a number of venture capitalists and hedge fund managers, have formed a group called StudentsFirstNY, a spinoff of the national group that Ms. Rhee, the former Washington schools chancellor, had formed to press for changes in how schools are run, The Times reports today.