Kay Redfield Jamison is a world-renowned psychologist who is an expert on bipolar disorder, from which she herself suffers.

Sourced:

"I have often asked myself whether, given the choice, I would choose to have manic-depressive illness. ... Strangely enough, I think I would choose to have it. It's complicated. Depression is awful beyond words or sounds or images ... So why would I want anything to do with this illness? Because I honestly believe that as a result of it I have felt more things, more deeply; had more experiences, more intensely; ... worn death 'as close as dungarees', appreciated it - and life - more; seen the finest and most terrible in people ... But, normal or manic, I have run faster, thought faster, and loved faster than most I know. And I think much of this is related to my illness - the intensity it gives to things"

-- An Unquiet Mind