. >> you told a story in the book about terrence graham and that was one case you were involved in. by the way, before we forget it, you're doing what right now? what is your job? >> i am a chair of a neurology department at the university of pennsylvania at the perelman school of medicine. >> how long were you there? >> two and a half years. i was at harvard 30 years before that. i was running a research lab and still have that as well but it was a research lab looking at brain development especially in early infancy and early childhood, thinking about new targets for treatments because actually because we say that adolescent brain is different from the adult. the baby brain is like a whole different ball game. it's a very, very different -- in fact, a lot of drugs that work well in adults don't work at all in the baby brain because the targets aren't even there yet. so an example is epilepsy which is an area i was studying and also premature brain injury. there are so many different types of cells and different drug targets and mechanisms of disease in that window that are very di