In 1997 , he took a leave of absence at the Technion - Israel Institute of Technology .
He was an adjunct professor at the Niels Bohr Institute from 1991 to 2001 .
In 1997 , professor took a leave of absence at the Technion - Israel Institute of Technology .
He was an adjunct professor at the Niels Bohr Institute from 1991 to 2001 .