What do the following people have in common?

What do these people have in common?

Larry Page & Sergey Brin (Google founders),

Jeff Bezos (Amazon founder),

Prince William & Prince Harry,

Gabriel Garcia Marquez (Nobel Prize winner for Literature)

Katherine Graham (ex-owner of the Washington Post)

Anne Frank (diarist from World War II)

Hundertwasser (famous artist)

AND MANY more ....

They all went to Montessori schools ...