Many research labs have both PhD students and postdocs. For principal investigators, what does a postdoc in your lab mean to you? What is your expectation of those postdocs?
Unfortunately, many do not see the reality. For at least some PIs, the Postdocs and PhD students are just cheap workers to be burnt - with the potential of becoming future competitors, if experimentall successful at all. Therefore, some PIs are focusing and managing in not supporting an experimental successful person. I have seen it sometimes that the most important person who made a lab successfull with many years of swimming against the stream finally was not supported at all to avoid her continuing the success story anywhere else.... Without using names, one of such persons was a first author in Cell... Then there are PIs who direct the results of students to the sons of a famous Professor, so that they support the "right" persons carreer. So, it looks to me that pursuing a scientific carreer selects for those opportunistic enough and with the right parents...
Of course, there are also quite a number of ideal examples... the reason why some of us continue in the game of science.
Postdocs are extremely important for the research lab and the PI:
1. Postdoc will test the hypothesis by performing the experiments of the PI with well-trained techniques and experiences.
2. Postdoc will re-examine the research projects and upgrade the scientific merit/technical soundness of the projects.
3. Postdoc trains the students and technicians in the lab.
4. Postdoc develops semi-independent projects with the guidance of the PI with his own strength in science, which is a great addition to the PI’s lab.
Unfortunately, many do not see the reality. For at least some PIs, the Postdocs and PhD students are just cheap workers to be burnt - with the potential of becoming future competitors, if experimentall successful at all. Therefore, some PIs are focusing and managing in not supporting an experimental successful person. I have seen it sometimes that the most important person who made a lab successfull with many years of swimming against the stream finally was not supported at all to avoid her continuing the success story anywhere else.... Without using names, one of such persons was a first author in Cell... Then there are PIs who direct the results of students to the sons of a famous Professor, so that they support the "right" persons carreer. So, it looks to me that pursuing a scientific carreer selects for those opportunistic enough and with the right parents...
Of course, there are also quite a number of ideal examples... the reason why some of us continue in the game of science.
i strongly support what Wang comments. Post docs are at the interface of being faculties or young investigators. So, they need to be enriched with scientific acumen and versatility.
Postdocs are godsend for the PI. Unfortunately the PI is so occupied with interfacing to the outside world, he/she will not have sufficient time to interact and support the graduate students. The postdoc will help in interfacing with the graduate students, help in their day-to-day activities, provide necessary laboratory help with instruments and equipment, write and check reports, generate new ideas for projects, etc. Practically they are used all aspects of research in the lab in the name of PI. As Robert said they are cheap workers like interns.
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