Mills was born on 21 July 1944 in Tarkwa, in the Western Region of Ghana. He was from from the town Ekumfi Otuam and was a member of the Fante people. He was educated at Achimota School, where he completed the Advanced-Level Certificate in 1963, and the University of Ghana, Legon, where he completed a law degree in 1967. Mills studied at the London School of Economics and Political Science and earned a PhD in Law at the School of Oriental and African Studies at the University of London after completing his doctoral thesis in the field of taxation and economic development, and was sometimes called by the nickname "The Prof".
Source : Wikipedia