What is a clinical epistemologist?  Epistemology is, literally, the theory of knowledge (episteme + logos = knowledge + theory).  But, that branch of philosophy generally deals with these issues in more abstract settings.  I work with the theory of knowledge with respect to a limited field--the design and analysis of experiments contributing to the development of treatment and detection technologies in oncology.  I help clinical and laboratory investigators determine what they can learn from a given experiment, potential or realized, and what they need to know to get from one experiment to the next.  I've also referred to this as "applications epistemology," but I thought "clinical epistemology" sounded more appropriate in the context of biomedical research.  "Biostatistician" sounds like somebody who plots a lot of Kaplan-Meier curves.  I don't do that so much, if I can help it.