so we'll engage in this conversation with tina tchen for about 40 minutes, after which we will welcomestions from the audience and we'll conclude around 8:15. so, ms. tchen, here we are. i will lead off and i'll ask you what were your responsibilities as the chief of staff to first lady, michelle obama. >> oh, well, thank you susan, thank you for inviting me and having me here. i'm actually going to answer a different question first. [laughter] >> because to answer the chief of staff responsibilities you have to answer the question what are the responsibilities of a first lady. because one of the things we used to talk about is there's no statute, right, there's no statutory responsibilities, there's no regulation that sets up an office of the first lady, as we used to say, there's no salary that comes with the office of being first lady of the united states. and so, entering into this, you know, you sort of come with a blank slate and had to do that. and that's one piece. that's the context for working in the east wing of the white house and then similarly chief of staff sort of follo