An Adjunct Investigator is a scientist who works full-time or
part-time in an intramural setting, whose primary career appointment
is elsewhere (e.g., medical school, university faculty, or at NIH
outside of an IC's intramural program). An Adjunct Investigator may
possibly be assigned independent resources, which are subject to
review by the BSC.
An Adjunct Investigator usually has more than 8 years of
post-doctoral experience, and may be classified under the Volunteer
Authority (link) when he or she is not paid by NIH but still
provides a service for NIH. [SD Minutes 11-05-86.6.]