This is the best idea. His superiors don't have an incentive to care otherwise. The professor's word is always taken over the student's and that tends to go for all situations where there's an unfair power dynamic like that. It reminds me of Tim Ferriss's blog post "Some Practical Thoughts on Suicide" where he talks about a professor bullying him. Which reminds me - bullying is a hot topic at the moment and would probably elicit some sympathy if framed that way. This is the top headline in my local paper in bellingham, WA today - "She spoke from the heart about being bullied in Lynden schools, and about 150 people listened." OP could get one of those little cameras like a Polaroid Cube and see if she can make the prof say something nasty again. The thing that the higher-ups in a college really pay attention to is maximizing their school's reputation.