In dog ethology the leader is called 'alpha'; after that it continues with 'beta' and 'gamma'.

We look up to him as our leader.

They chose him for their leader.

They looked on him as their leader.

They look up to him as their leader.

They submitted to their leader's order.

He was looked up to as their leader.

He is looked up to as a leader.

He was the leader of the great expedition.

Japan is a leader in the world's high-tech industry.

A question arose as to who should be the leader.

We look up to Tom as our leader.

We regard John as our leader.

I discouraged my sister from going out with the leader of the pack.

I'm the leader of this team.

We chose her to be our leader.

We look up to him as our leader.

We elected him our leader.

Everyone looked on me as a leader.