Who said "A leader leads by example."?

This quote is attributed to Estelle Costanza.

A leader leads by example. - Estelle Costanza

"A leader leads by example."

Estelle Costanza Leadership

"You're killin' me, you know that?"

"I'm telling you, the woman is crazy!"

"Frank, you're scaring me!"

"Why are you always yelling?"

"A leader must be fair and just."

"Integrity is everything."

"One must take responsibility for one's environment."

"In this house, I make the decisions"