The news media form major sources of information to the general public in matters of science and health. And yet journalists and experts differ in what they consider as newsworthy and relevant. This article analyses in detail a current affair interview with a health expert reporting on a new research on attention deficit hyperactivity disorder. Applying Bamberg’s three-level model for positioning analysis, the interview is searched for the stories that speakers introduce, attend to their embedding in the design of questions (...) and answers and examine how their tellers are positioned therein as knowledgeable regarding ADHD. The narratives identified are shown to enable the adopting and shifting between various expert positions including that of the scientific researcher, the advice-giving expert and the more specific identity of the public health clinician. Shifts between these positions are shown to reflect the claims and counter-claims that the interviewee and interviewers are making and backing. These findings are discussed for their implications regarding the use of narratives in presenting science to media audiences. (shrink)