In her book, Multipliers: How the Best Leaders Make Everyone Smarter, Liz Wiseman describes two types of leaders. The first, diminishers, are those who drain intelligence, energy, and capability from the people around them or those who always need to be the smartest person in the room.
On the other side of the spectrum are leaders who use their intelligence to amplify the smarts and capabilities of the people around them. These leaders are known as multipliers. They inspire others to stretch themselves to deliver results that surpass expectations.
A good rundown of the actions which identify teacher leaders who use their intelligence to amplify the abilities of those around them.