I'm not sure he signed up for it, but my mentor is David Abraham, now managing director of UKTV.
I saw him making a presentation while I was in Canada. He was so inspiring about what he was doing at Discovery UK that I decided then and there I wanted to work with him.
Two years later a vacancy came up and I got the job. However, just after I arrived in the UK, it turned out David was moving on. Now he is my competitor, but he is constantly raising the bar and I'm still getting inspiration from him.