I think its Sinclair
Yes, Thanks
www.tmz.com/2011/04/27/barack-obama-birth-doctor-delivery-birth-certificate-ivalee-sinclair-dr-david-a-sinclair-attendant/
David Sinclair is correct.
He died in 2003 and his obit apparently appeared in one of the Honolulu newspapers. (Would you think that the Obamatons would have released a document with a still alive and functional doctor's signature on it?) It might be helpful to get info as to what type of practice he had at the time, perhaps from surviving relatives.