You seriously need to go back to school or read stuffs like WSJ or NYT . Not solely the football message boards. I'm not here to explain how US economic policy works. Your knowledge on economy is extremely limited. I've encountered numerous graduates from UMN, Cal, MIT, Duke business school. But none of them need that kind of explanation. If you have time, start from Econ 101 again. Economic schools have their own doctrines, and based up where they graduated from, economists are incline to use that doctrines to formulate the long term and short term policies.
These researchers are integral part of US policy making process and if you're looking for how many UMN graduates are employed at the Fed, you're a fool. But you can have an idea who is who in policy making world by check their resume and where they graduated from. If you want to and you have time you can look up all of Fed data, check CVs, and make a list.
I don't have time to track down how many of them are UMN, Chicago, MIT or Cal graduates. I don't have time to educate you on how US economic policy works.
It is the fiduciary duty of your university to educate you, explain you and enlightened you.