On which network did 'One Tree Hill' originally air?

On which network did 'NCIS' originally air? In what year did 'NCIS' premiere? Where is 'NCIS' set? Who created 'NCIS'? In what year did 'One Tree Hill' premiere? Where is 'One Tree Hill' set? Who created 'One Tree Hill'? On which network did 'Nip/Tuck' originally air?