His research focuses on cuprate superconductivity, conceptual issues in the foundations of quantum mechanics, superfluidity in highly degenerate atomic gases, low temperature properties of amorphous solids and topological quantum computation.
The 29 December 2005 edition of the International Herald Tribune printed an article, "New tests of Einstein's 'spooky' reality", which referred to Leggett's Autumn 2005 debate at a conference in Berkeley, California, with fellow Nobel laureate Norman Ramsey of Harvard University [REF].