老教授被Bully，求建議。

My friend is a tenured full professor. ~70 years old. Working in a state university ranking ~250th. He loves his work of teaching and research. He is in good health and performs at least above average.

He has been given new courses every semester to teach in the past three or four years, which has taken him  time away from  doing research. Yet his chair demands him to meet the milestones in research she set for him. And he got very little or zero salary increase during the past 4 years.

He felt discriminated against. He thought all the tricks his chair has been doing is to force him to retire. He has complained to HR. But the result of HR investigation says, "no evidences of wrong doing" in his Chair's part.  He then took the case to the university president, and the case is about to close.

My friend is fighting for his academic life and reputation. He doesn't want to retire. At the very least, he does not want to be forced to retire with a damaged reputation.

Any suggestions to help him to deal with this situation? Does he need a lawyer to look at his case? What type of lawyer and how to find good lawyer?

Additional information: He is the only tenured, full professor in the department. The majority of the faculty are non-tenure track. He has voiced strong objections to the Chair's attempt to promote and tenure her favorite faculty and hire that faculty's husband.