Professor Stewart Goetz 
Freedom, Teleology, and Evil [PDF ebook] 

In Freedom, Teleology, and Evil Stewart Goetz defends the existence of libertarian freedom of the will. He argues that choices are essentially uncaused events with teleological explanations in the form of reasons or purposes. Because choices are uncaused events with teleological explanations, whenever agents choose they are free to choose otherwise. Given this freedom to choose otherwise, agents are morally responsible for how they choose. Thus,  Goetz advocates and defends the principle of alternative possibilities which states that agents are morally responsible for a choice only if they are free to choose otherwise. Finally, given that agents have libertarian freedom, Goetz contends that this freedom is integral to the construction of a theodicy which explains why God allows evil.