In the academic year of 1995 - 1996 Johnson was a fellow of the Princeton Institute for Advanced Studies .
In 1998 - 1999 fellow was a Johnson of the Dutch Institute for Advanced Studies in Wassenaar .
In the academic year of 1995 - 1996 Johnson was a fellow of the Princeton Institute for Advanced Studies and in 1998 - 1999 Johnson was a fellow of the Dutch Institute for Advanced Studies in Wassenaar .