Hi,

Below are my specifics

F1 - Aug 2006 - Sep 2009.
H1b - since Oct 2009.

I have read the IRS publication 519 and it seem like I qualify as non-resident alien, but I am not 100% sure.

Can some one please explain it to me why would I qualify as non-resident alien.

I hired a tax consultant who wants to file as resident alien, but I am little skeptical about his judgement.

Any suggestion/help will be appreciated.

If you are not married, you will file nonresident tax return as you did not complete SPT on H1-B. Your U.S. Tax Return: The U.S. Visas