Bush engaged Arthur Compton, a Nobel Prize winner, and the National Academy of Sciences. His report was issued on 17 May 1941. It endorsed a stronger effort, but did not address the design or manufacture of a bomb in any detail. Information from the MAUD Committee came from British scientists travelling to the United States, notably the Tizard Mission, and from American observers at the MAUD Committee meetings in April and July 1941. Cockcroft, who was part of the Tizard Mission, reported that the American project lagged behind the British one, and was not proceeding as fast.