Here is more from Wonkblog:
The Tax Policy Center is the cool, nonpartisan, analytical yin to [Grover] Norquist’s hot, ideological, activist yang. The center is directed by Donald Marron, a former Bush appointee, and staffed by a who’s who of tax wonks who’ve served in both parties. They produce the best and most respected tax numbers in town, and they’re fearless while doing it. It was their analysis that showed Mitt Romney’s tax plan could not possibly fulfill all its stated objectives at the same time, and it’s been their work that has made clear the size of the tax increases embedded in the fiscal cliff. Their work has truly been essential over the last year.TPC is a joint venture of the Urban Institute and the Brookings Institution.