A 2004 report by Colin I. Bradford and Johannes F. Linn of the Brookings Institution asserted the group was founded primarily at the initiative of Eichel, the concurrent chair of the G7. However, Bradford later described then-Finance Minister of Canada (and future Prime Minister of Canada) Paul Martin as "the crucial architect of the formation of the G-20 at finance minister level", and as the one who later "proposed that the G-20 countries move to leaders level summits". Canadian academic and journalistic sources have also identified the G20 a project initiated by Martin and then-US Treasury Secretary Larry Summers. All acknowledge, however, that Germany and the United States played a key role in bringing their vision into reality.