years_active other_names article_title name occupation
1981 -- present john f. showalter john showalter -lrb- director -rrb-
 john showalter television director , editor and producer
john showalter -lrb- director -rrb-

john f. showalter is an american television director and editor .
some of directing credits include `` ghost whisperer '' , `` house '' , `` criminal minds '' , `` without a trace '' , `` supernatural '' and `` the mentalist '' .
as well as editing episodes of '' '' , `` gideon 's crossing '' and `` glory days '' .
