Employment Law Questions? Ask an Employment Lawyer.
Thank you for your question. I look forward to working with you to provide you the information you are seeking for educational purposes only.
Under the law, employment is considered to be at will, meaning that the employer can demote, hire and fire an at will employee for no reason at all or for any reason at all as long as they are not doing so based only on your race, age, national origin, disability or sex. So in order to have recourse you have to prove that one of those reasons for your demotion, then your first step is filing a complaint with the EEOC, as they have to investigate first to grant you a right to sue letter.
Just because they want to have your position as director of a large charity is not an illegal ground for demotion. If the ground is not an illegal ground for demotion, you could not sue the employer for that demotion I am afraid.
State law and site policy prevents us from making personal attorney referrals, so the best we can do is tell you to get a local attorney after you file your EEOC complaint, at the same sites used by other attorneys, http://www.hg.org or http://www.lexmundi.com.