This paper examines the bearing the opposing notions of Free Will and Determinism have on the question of responsibility and human agency. In using Sartre as representative of the first and Skinner as representative of the second, this paper tries to analyze the actions of the Hiker in Sartre’s being and Nothingness in order to critically examine the two notions as well as to reach a semi-compatibilist position on the question of human responsibility and agency.