Bill Gale:

of the Brookings Institution is the go-to guy on tax reform.

http://www.brook.edu/scholars/wgale.htm

202-797-6000

UPDATE: John Irons says:

In case you can't get Bill on the phone, he was on a panel at the Center for American Progress last friday talking about tax reform. http://www.americanprogress.org/site/ apps/nl/content3.asp?c=biJRJ8OVF&b=593305&ct=1524525 or go to http://www.americanprogress.org/ and click on the events page and find the tax panel...