system
Given the following post, respond as if you're commenting on Reddit:
human
Bullying from colleague. What should I do?

I don't want to go into the details, but a colleague is bullying me. Both of us are lecturers in a department. There is no one running our department except an administrator responsible for many programs. Should I go to HR?
gpt
Document everything, record if you can. Have as clear and incontrovertible a case as possible before going to the dept head (if possible, go to HR too). A simple "one said, the other said" won't do it. Make it iron clad like you're preparing to sue, because that is the effective standard of proof for harassment claims--and this is one.