In 1928, he became Professor of Spanish at Oxford University for three years, during which time he wrote a book on nation psychology called Englishmen, Frenchmen, Spaniards.
1928. aastal sai temast kolmeks aastaks Oxfordi Ülikooli hispaania keele professor ning sel ajal kirjutas ta rahvaste psühholoogiast rääkiva raamatu "Inglased, prantslased, hispaanlased" ("Englishmen, Frenchmen, Spaniards").