An Open Letter
I was intrigued by your recent comments to the effect that you are frustrated by the level of involvement and interaction that you observe from junior faculty. I agree that we might expect greater things to result when members of the department collaborate scientifically. I appreciate that a Department is not a Department if the professorial rank staff do not interact with each other on common goals. As the leader, I understand that it is your job to try to elicit more than the minimum effort on so-called service work from your Department members.
I have a suggestion, which I believe is basic Management 101 stuff although it is possible that it comes from my roots in behavioral psychology. Have you ever thought about the needs of your Assistant Professors (and Assistant Adjunct Research Project Science Instructor Professors-in-Residence of Department)? Have you thought clearly about the contingencies that are in place which either encourage or discourage particular types of activity? Have you identified the roles played by the senior faculty and the University in providing the reinforcers and punishers?
The ranks of the more-junior independent scientists are facing a career environment that is entirely different from the one you faced at a similar stage. You would do best to realize this and interpret their actions accordingly...instead of wondering out loud why your Assistant Professors are not acting as you wish.
If I can leave you with two generalities, they are these. First you must listen to what your Assistant Professors (all of them) are saying to you. Don't modify every comment by thinking the individual is "lazy" or "arrogant" or "selfish" or "narrowly focused" or "insufficiently committed to the career" or any such thing. Listen to what his or her specific needs are. Second, all of them need the support to get their research programs launched, productive and funded. In a way that makes their output look as independent as possible. They need research resources..equipment and supply money. They need real dollars to support trainees or they will never get off the ground. Try directing the slush funds their way, unasked for once. If you free up their time spent working on survival you may be surprised how enthusiastically they respond.