a market 'leader' [=a product or company that is more successful than all competing products or companies]
He is the league 'leader' in home runs. [=he has the most home runs in the league]
He's a 'born/natural leader'. [=someone who has qualities that a good leader has]
(..) Consider the cochlear optic nerves have been critically damaged. He'll be blind in one eye. And most likely deaf. Frankly, Dr. Norton and the Omni foundation are the leaders in this field. In my opinion, this is the only chance your husband has. I'd seriously consider their offer. (..)2014 RoboCop