1. As a Ph. D: main contributor to 3 SCI papers in a single field.
2. Assistant Professor: main contributor to 5 SCI papers in two fields (combined), and significant contributor to 10 SCI papers(including the previously mentioned ones).
3. Associate Professor: main contributor to 10 SCI papers in at least two fields; significant contributor to 15 SCI papers. Supervisory experience of at least 2 postdoctoral or graduate assistants. Principal investigator of at least one significant grant.
4. Full Professor: main contributor to 15 SCI papers in at least two fields; significant contributor to 25 SCI papers. Supervisory experience of at least 5 postdoctoral or graduate assistants. Principal investigator of least two significant grants. Coordinator of at least 1 international academic activities.
Please keep in mind that there is a time interval of 3-4 years between each level, so this is a fair estimate of the amount of research work of a maturing scientist should be able to do.
A 3-SCI associate professor? I probably won't hire him for a posdoc. A search committee would consider a candidate's ability to work independently and to move to new fields; that's why there have to be significant work in at least two fields. Fresh Ph. Ds, unless the very best ones, still need considerable amount of guidence to be "out of the nest." I put this period to 1-2 years. If he couldn't move (QUICKLY) beyond what he has learned in his Ph.D years then his academic future is a dead end.