Quinn, a former Black Cats striker, said: "I first met Ellis at the Ryder Cup in 2006 and he was immediately interested in the Sunderland story. He caught the football bug following his move to the UK 10 years ago
"Even before today he has personally invested more in Sunderland than all previous chairmen, directors and owners combined."
The move by Short makes Sunderland the fourth Premier League club to have US owners, joining Manchester United, Liverpool and Aston Villa.
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