Dan Siegel, along with three GAINS Board Members, Richard Hill, Mary Meador, and Kirke Olson explored Dan Siegel’s latest book, Mind: a Journey to the Heart of Being Human. In this fourth meeting we discussed chapters 6, 7, and 8 of the book: Where is mind? A Why of Mind? and When is Mind? Although its contents―its emotions, thoughts, and memories―are often described, the essence of mind is rarely, if ever, defined.