I see [JeffE](https://academia.stackexchange.com/users/65/jeffe) mentioned the existence of a faculty mentor in his [comment](https://academia.stackexchange.com/questions/11903/as-a-dissertation-advisor-how-can-i-best-help-a-typical-graduate-student#comment21937_11903) on [this question](https://academia.stackexchange.com/questions/11903/as-a-dissertation-advisor-how-can-i-best-help-a-typical-graduate-student), so I am wondering if there is usually a faculty mentor for every junior professor (e.g., newly hired untenured profs). If yes, what are their roles?