Original: John Avery Whittaker , voiced by Hal Smith ( 1987 - 1994 ) , Paul Herlinger ( 1996 - 2008 ) , and Andre Stojka ( 2009 - )
Simplified: John Avery Whittaker , voiced by Hal Smith ( 1987 - 1994 ) and Paul Herlinger ( 1996 - present )