Daniel Levitin was interviewed today on NPR's Diane Rehm Show about his book, "The Organized Brain". He has great things to say about GTD. I know the book has been out for some time...but I bought it today based on the interview. His research fits with what we are all seeking. You can listen to it at: http://thedianerehmshow.org/shows/2015-09-10/daniel-levitin-the-organized-mind