Which professors are involved in the tenure decision (in USA)? (associate, full, tenure-track who becomes tenured before I get tenure etc...) Which professors are involved in the tenure decision? Is it all tenured professors, or also the one still on tenure-track? If only tenured, which is the date in which they get tenure that matters? For example, I am in my second year of tenure-track position, will a person who is in his/her third year of tenure-track position have a word about my case? Basically, there is person I am doing all my best to get along with, but on his/her side it is just not happening. I have great relationship with most people, but this person just doesn't like me. I tried so hard to talk with this person and makes things right. In which cases will this person have a word to say?
You should ask your department chair, as practices can vary.

Usually, all promotion decisions are voted on by faculty who have already received the promotion.  So for tenure, only tenured faculty will vote.