Is it a bad idea to choose a PhD adviser who is relatively young and hasn't reached "associate" professor yet? This guy is still an "assistant" professor without tenure. He got his PhD a few years ago so he is pretty new and as a result he does very new and interesting research. Should I not worry about his academic status or job security and just focus on the fact that I like his research? Is it possible for a PhD adviser to lose his job as a professor while a grad student is half way through the project?