When he died in 1955 , he was succeeded as head of UEFA by his son Pierre Delaunay .
He was General Secretary of UEFA from its foundation on 15 June 1954 until his death .
When General Secretary died in 1955 , General Secretary was succeeded as head of UEFA by General Secretary 's son Pierre Delaunay .
He was General Secretary of UEFA from its foundation on 15 June 1954 until his death .