Original: Alex (1976 - September 6, 2007) was an African Grey Parrot and the subject of a thirty-year (1977-2007) experiment by animal psychologist Irene Pepperberg, initially at the University of Arizona and later at Harvard and Brandeis University.
Simplified: He was part of a study under animal psychologist Irene Pepperberg since 1977 at two different universities: Brandeis University in Massachusetts and before that, University of Arizona.