N.B. But I think the authors are wrong to assert (as they do) that the really important part of any model of inference is the computational part. (They characterize Schum diagrams as "mere representations.")
Student of the law of evidence, evidence, inference, and investigation. Sometimes writes books. Sometimes writes articles. Sometimes tinkers with computer programs to support the marshaling of evidence for legal activities such as trials and pretrial discovery and investigation. And sometimes takes photographs.