All we need is to hear him speak because its almost impossible for a native Arab to hide his/her accent. Like justiceseeker93 said, there were very few if any Arabs around 1950. This guy is definitely foreign born. As for where he attended med school, I will bet it was not in the US. All foreign graduates are required to taken an exam (USMLE) in order to get into residency programs. Its only after finishing the program that they get certified as MD ‘s and allowed to work. The media will try their best to suppress if he turns out to be a foreign graduate but it will come out eventually.
The JihadWatch link states that he went to Columbia Medical School.
There have been Arabs in this country, some of them Muslims, for several generations, especially in Dearborn, Michigan, but also throughout the East Coast. Many of these mosques that were traditional have now been taken over by Wahhabis.