The term information scientist developed in the latter part of the twentieth century by Wm.
Hovey Smith[1][2][3] to describe an individual, usually with a relevant subject degree (such as one in Information and Computer Science - CIS) or high level of subject knowledge, providing focused information to scientific and technical research staff in industry.
The term was, and is, also used for an individual carrying out research in information science.
Brian C. Vickery mentions that the Institute of Information Scientists (IIS) was established in London during 1958 and lists the criteria put forward by this institute "Criteria for Information Science" (appendix 1) as well as his own "Areas of study in information science" (appendix 2).
See also Award of Merit - Association for Information Science and Technology "Pioneers" of Information Science scrapbook: https://web.archive.org/web/20140201230801/http://faculty.libsci.sc.edu/bob/ISP/scrapbook.htm