I want to ask who is the director of High school musical?

The director is Kenny Ortega.

It is directed by Kenny Ortega,
Produced by Don Schain,
Written by Peter Barsocchini,

Starring:
Zac Efron
Vanessa Anne Hudgens
Ashley Tisdale
Lucas Grabeel
Corbin Bleu
Monique Coleman

If U wanna know more, go to:
http://en.wikipedia.org/wiki/High_School_Musical

Kenny Ortega is the director of High School Musical&High School Musical 2.
If you have now at home, you can watch 450(Hong Kong Disneyland Pomote Channel) You can see Kenny Ortega and the artists. And watch some music video of High School Musical 2.