Now I don't know much about Mr. Summers but from what I've read on Wikipedia, It doesn't appear that he is an enemy of wall street/Hedge fund community.
He was part time managing director of D.E. Shaw.
D.E. Shaw is hedge fund that quote:
"The firm, through various affiliates, specializes in applying quantitative and qualitative trading strategies to hedge fund management and other investment"
Just putting 2 and 2 together. Hopefully he left on good terms.
http://www.deshaw.com/articles/20061019.pdf
He was part time managing director of D.E. Shaw.
D.E. Shaw is hedge fund that quote:
"The firm, through various affiliates, specializes in applying quantitative and qualitative trading strategies to hedge fund management and other investment"
Just putting 2 and 2 together. Hopefully he left on good terms.

http://www.deshaw.com/articles/20061019.pdf