words of introduction for keith -- he is william nelson cromwell in the department of politics at princeton university. he is the author of the current book speak freely as well as constitutional construction, divided powers in constitutional meaning and constitutional interpretation in the sexual meeting with the judicial review and a third book political foundations of judicial supremacy in the present in the spring court and the constitutional leadership in us history. this work has made professor whittington along with the late justice antonin scalia a major exponent of a leading school of constitutional institutions with public meaning over journalism. that sounds esoteric but trust me it's a very big deal. he is written several other elderly works in american constitution. he's a very ambitious fellow and one of which is repugnant laws judicial review and accept congress from the founding to the present and the second one is the idea of democracy in america from the american revolution to the gilded age. i have known keith for many years and is a delight to have you here. >> thank you