Another riddle

Who is it that thinks the Nifty Nine
Is a group of people almost sublime?
To keep us close is his big aim,
Staying in touch is the name of his game.
He knows about stocks an music, too,
A Beethoven Sonata he can play right through.
He's organized baseball games in the water
And tries to get brothers to do what they ought'a.
He's 22 years of age today,
Next year he'll be living far away.
So wish him well as he's off on his start,
For whatever he does, he wants us to be a part.