Who was the chief of American Samoa?

I am not sure which chiefs you mean. One of the last ones, around 1899, was Tuimanu'a Elisala. But since then, American Samoa is a United States territory, and its leader is whoever the current American president is-- in this case, President Obama. American Samoa does still have its own local leader, but it's not a chief-- it's a governor. The current governor is Togiola Talalelei A. Tulafono.