i've worked in now for as a doctor since 1978, first at the public hospital, cook county, then at mount sinai. and i was recruited run an academic medical center, actually, you can walk here, too, to rush. but all along, one street on the west side of chicago and patients came with me and i was really struck when i got to rush where was the inaugural chief medical officer for the hospital about the one street two world of living and health care that seemed to be invisible. and so i was motivated to write the death cab to really point out that there are these large gaps of life expectancy, literally you can walk from one neighborhood to another and lose 30 years of life expectancy. but not only that, the root causes, these were not biological. they were not behaviors, but but related the conditions under which people and yet it was largely invisible all driven by two things in equality in inequity. i do want to point out in the far corner is dr. kristen palico help write the book. she was pre-med and really helped me publish a book. we wrote it together perfect. and so dr. fisher, sort of, you