Quinn, who retired from playing in 2003 at the Stadium of Light, believes he has left the club in good hands under Short and manager Martin O'Neill as he plans to return to his native Republic of Ireland to explore other business opportunities away from football.
Niall Quinn: "I've had the most amazing six years and it gives me a huge sense of pride to see where Sunderland is today.
"Sunderland is in an incredibly fortunate position to have a hugely talented team of people leading the football club right now.
"There is a tremendous amount of energy about the place and the Board and the executive management team are a dynamic and committed group, who hold the best interests of the club at the core of all they do.
"Everything is in place for Sunderland to really make a statement, which was always my aim.
"From a football perspective, securing the services of Martin O'Neill has been an absolute highlight.
"In Martin we have a man that understands the region, the club and the unique place it holds in the lives of its supporters and I am confident that he will harness the immense passion that exists here and take us to new heights.
"As for the great Sunderland fans, I would like to thank them for the trust they placed in me."