 Innis got his first taste of university teaching at Chicago , where he delivered several introductory economics courses . One of his students was Mary <unk> , the woman he would marry in May 1921 when he was 26 and she 22 . Together they had four children , Donald ( 1924 ) , Mary ( 1927 ) , Hugh ( 1930 ) and Ann ( 1933 ) . Mary <unk> Innis was herself a notable economist and writer . Her book , An Economic History of Canada , was published in 1935 . Her novel , Stand on a Rainbow appeared in 1943 . Her other books include Mrs. <unk> 's <unk> ( 1965 ) , The <unk> Spirit : Canadian Women and Their Times ( 1966 ) and <unk> the Years ( 1949 ) , a history of the Young Women 's Christian Association . She also edited Harold Innis 's posthumous Essays in Canadian Economic History ( 1956 ) and a 1972 reissue of his Empire and Communications . 
