He specialized in phase transitions , such as those occurring when an insulator suddenly becomes a conductor or when water freezes .
After receiving his Ph. D. from the Technical University of Denmark in 1974 , Bak worked at Brookhaven National Laboratory .
Bak specialized in phase transitions , such as those occurring when an insulator suddenly becomes a conductor or when water freezes .
After receiving his Ph. D. from the Technical University of Denmark in 1974 , Bak worked at Brookhaven National Laboratory .