Joe Castiglione has been working toward a day like Tuesday for over a decade.

"He's only told me so a million times," OU president Joseph Harroz Jr. said.

Standing inside the OU Health Sciences Center library, the Sooners ' longtime athletic director — who's retiring from his full time role during this school year, but will stay on as AD emeritus — used the word "historic" to describe the moment. Since the Regents approved the Gaylord Family — Oklahoma Memorial Stadium master plan in 2014, the Sooners have undergone south end zone, north scoreboard and seating bowl improvements.

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