A human rights defender is someone who acts on behalf of individuals or groups to defend any human right (or rights). Human rights defenders work to advance and protect civil and political rights, as well as to advance, protect, and realize economic, social, and cultural rights.
HowDefender_Description
A human rights defender might be anyone; there is no set qualification for this position. Those "persons, groups and associations ... contributing to ... the effective elimination of all breaches of human rights and fundamental freedoms of peoples and individuals" are referred to in the Declaration on Human Rights Defenders.