Who said "One must always be professional, especially in public."?

This quote is attributed to Principal Seymour Skinner.

One must always be professional, especially in public. - Principal Seymour Skinner

"One must always be professional, especially in public."

Principal Seymour Skinner Truth

"I'm Seymour Skinner, Principal of Springfield Elementary, and I run a tight ship."

"Detention is not a punishment, it's an opportunity for reflection."

"The squeaky wheel gets the grease, but the nail that sticks up gets hammered down."

"I've dedicated my life to education, and by God, I'll see it through!"

"Lucy, you got some 'splainin' to do!"

"You must always be honest with the people you love."

"Truth always comes out in the end."

"Honesty is always the best policy."