sentences:  Taking advantage of a Commonwealth Fund fellowship, he travelled to the United States and spent a year as a Research Scholar at the Institute of Fine Arts, New York University from 1958 to 1959.After his return he curated a Gainsborough exhibition for the Arts Council and in 1962 he received his PhD for research into Gainsborough's landscape paintings.He was Visiting Professor of Fine Arts at Yale University from 1960 to 1970.