The fonds consists of correspondence, press clippings, speeches, articles, diaries, scrapbooks, reports photographs, sound recordings and a large collection of political cartoons. The material covers the period from his earliest American accountancy training in 1923 through his professional career and public career as Auditor General of Canada 1960 to 1973 to his present interests. It is in his role as watch dog and critic of government spending that Mr. Henderson is best known and the major part of the fonds is concerned with this role. Mr. Henderson's frank and articulate comments and criticisms of government expenditures and procedures aroused public interest and conflict with the government, especially that of Prime Minister Trudeau. These aspects are well represented in the fonds, along with Mr. Henderson's significant, but less visible, international accounting work.