Who created 'Hill Street Blues'?

On which network did 'Magnum, P.I.' originally air? In what year did 'Magnum, P.I.' premiere? On which network did 'Hill Street Blues' originally air? In what year did 'Hill Street Blues' premiere? On which network did 'Knight Rider' originally air? In what year did 'Knight Rider' premiere? Who created 'Knight Rider'? In what year did 'Cheers' premiere?