A
psychologist who studies what he refers to as 'optimal experience' or
flow. In addition to a number of scientific studies, he has authored the book
Flow: the Psychology of Optimal Experience. His last name is pronounced, I believe, something like 'chick-sent-me-hall-yee'. (Unfortunately, I can't provide an
IPA transcription for you in this format.) According to a
prof of mine who knew him in her
graduate work, everyone calls him Mike.