Captain McCoullough was a Starfleet captain known for having written the revised first contact protocols for Starfleet.
In 2369, after trying to remember his name for six hours, Benjamin Sisko finally recalled it while at Quark's. He wished aloud that McCoullough was on Deep Space 9 instead of him to supervise first contact with the incessantly gambling Wadi.
Exhausted ("With all due respect to the procedures and to McCoullough, I have had it."), he finally decided to leave the bar and let Quark handle them. (DS9: "Move Along Home")