Ask Marilyn ® by Marilyn vos Savant is a column in Parade Magazine, published by PARADE, 711 Third Avenue, New York, NY 10017, USA. According to Parade, Marilyn vos Savant is listed in the "Guinness Book of World Records Hall of Fame" for "Highest IQ."
In her Parade Magazine column of October 10, 2004, Marilyn attributes the quotation "If I have seen further, it is by standing on the shoulders of giants," to Bernard of Chartres.
The statement in the form given, is that of Isaac Newton. Bernard of Chartres is apparently the author of something like:
"We are like dwarfs standing [or sitting] upon the shoulders of giants, and so able to see more and see farther than the ancients."
-- Bernard of Chartres, circa 1130
(from http://www.aerospaceweb.org/question/history/q0162b.shtml)