As Wikipedia explains, "GiveWell is an American non-profit charity evaluator created in 2007 by two former Bridgewater Associates investment analysts, Holden Karnofsky and Elie Hassenfeld." Their main mission is to identify good causes that might then receive substantial funding.
One of the topics they've identified as a possible cause to consider funding is design work on fundamental tax reform. So they have been interviewing various people in the field, most recently me. You can find a file memo regarding their conversation with me here.
I was not as bullish as I would like to have been about charitable funding to develop new tax reform ideas, because of the great respect I have for the various plans that are already out there (e.g., X-tax, Graetz plan, income tax base-broadening), along with my view that the main obstacles are political rather than technical.