sentence: John Tomlinson , in his study Cultural Imperialism , examines the work of Ariel Dorfman and Armand Mattelart , whose 1971 book Para leer al Pato Donald -LRB- trans : How to Read Donald Duck -RRB- identifies that there are `` imperialist ... values ` concealed ' behind the innocent , wholesome façade of the world of Walt Disney '' ; this , they argue , is a powerful tool as `` it presents itself as harmless fun for consumption by children . ''
question: who _ _ studied something _ _ ?
answers: John Tomlinson