In the ID blog "Evolution News", Casey Luskin described him as Godfather of the intelligent design movement, PBS said he was "known as the father of intelligent design". He is a critic of methodological naturalism (the basic principle that science can only investigate natural causes for observable phenomena), and espouses a philosophy he has coined "theistic realism." He is the author of several books on intelligent design, science, philosophy, and religion, as well as textbooks on criminal law. He has appeared on various programs such as PBS's "Firing Line" and a "Nova" episode, "."