Julian Vasquez Heilig is an education researcher at the University of Texas who keeps close watch on the reform issues of the day. Here is his website: cloakinginequity.com
He wrote a withering critique of Teach for America in the New York Times, calling it “a glorified temp agency.”
He has conducted important research on Teach for America and KIPP that reviews their claims.
Equity in education is the focus of his research.
He is a rising star in the research community.
Diane Ravitch's blog 
I think some people need to jump in on the comments on his blog. It’s already stocked with TFA alumni who are defending their camp. I don’t have enough knowledge or facts about their institution.
TFA = Temp agency. What a great line! Gonna have to use that one.
Temp agency is mild, and too kind: it’s a replacement worker/scab agency.
With school budgets being cut everywhere, it is very hard for me to see how what is left to put teachers in the classroom is spent on signing a contract with TFA and paying for them to come and teach for two years and then all too often systems have to start again. I was glad to see that Heilig brought this to the attention of the Louisiana public in the LPB interview.
Notice that the NYTimes Picks were pro TFA.