Should I try to warn administration about truly unacceptable professor behavior?
Should I try to warn administration about truly unacceptable professor behavior?


While it's tempting and noble to want to help others who have to deal with your previous advisor, my suggestion would be: 


Move on with your life,
Do the best research/teaching you can, and
Try to make a positive impact on those in your relatively local area (students, collaborators, etc.)


I have some familiarity in dealing with unacceptable supervisor behavior. My former PhD advisor threatened me with physical violence and kicked me out of the program. Another senior faculty member and most of the students in our research group witnessed the event, but none of them would admit to my face what happened. I effectively had nobody willing to provide an eyewitness account of the events (I suppose they were too worried about their own fate; one of the students who witnessed the event is now a tenured faculty member at a top 5 school in my field).

From the fallout of this situation, it was hard enough for me to move on with my goal of getting a PhD without having a recommendation letter from my previous advisor. Once I was able to get into another program, I set out to do the best work I could do and this drives what I do to this very day. 

Sure, there are times I wished I would've brought this matter to the attention of administrative staff of my previous institution, but then I recall how difficult it was for me to get back to where I wanted to be, and I try to do the best I can in my little corner of the world using my abilities and not worrying about that "other guy." Plus, I'd like to think that if they screw up enough, someone "important enough" will witness it and take the appropriate actions.

I personally see way more downside in lodging an official complaint with the administrative personnel than moving on as I suggest, simply because you have no way of knowing the severity of how painful your former advisor can make your life and the impact this can have on your career.

Good luck.