D onald Campbell, master of many disciplines, died in May 1996 at the age of 79. Campbell, who is most well known in psychology as a hardheaded methodologist, is one of the world’s most important thinkers in evolutionary philosophy. Inspired by Turchin’s (1977, 1981) analysis of metasystem transition and contemporary scholarships on multilevel selection theories (Baum & Singh, 1994; Boyd & Richerson, 1985; Wilson & Sober, 1994) and drawing on the principles of evolutionary epistemology Campbell developed earlier, Heylighen and Campbell (1995) formulated a theory of collective evolution.