Statistician who formulated purchasing power parities. Salem was a mathematical statistician whose name is immortalised in the method of computing purchasing power parities (PPPs) of currencies, for conversion of national currency-denominated economic aggregates, like gross domestic product, into a common, comparable currency unit. His career with impressive academic profile through teaching in American University of Beirut, Syrian University, and years of involvement in international statistical organisations such as the United Nation. Salem Khamis was born in a small village in the Nazareth district of Palestine. He was endowed with brilliance and was a passionate and vigorous supporter of the establishment of a Palestinian homeland.