 He and co-author Joanne Souza have developed the theory further in a self-published book, "Death from a Distance and the Birth of a Humane Universe" (BookSurge, 2009).This work builds on W.D.Hamilton’s theory of kin selection (Benefit x Relatedness > Cost) and posits that the genus "Homo" evolved when an ancestral organism developed the ability to effectively manage non-kin conflicts of interests by lowering the cost of coercion between non-kin individuals (Benefit > Cost of Coercion + Cost of Cooperation).