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}}</ref> They are known for their writing and their [[intersex ]] and non-binary [[human rights]] activism and as one of the first people to come out in national and international media as a nonbinary [[intersex ]] person.<ref name="Bibliography">{{REFweb

In 1996, Viloria participated in the first international [[intersex ]] retreat. They reported that, eager to meet people like themself, instead they "met people who'd been traumatized and physically damaged by cosmetic genital surgeries and hormone treatments they'd been subjected to in infancy and childhood, and it moved [Viloria] to become an intersex activist."<ref name="Intersexion">{{REFweb

In 2004, Viloria testified before the San Francisco Human Rights Commission on the need to ban medically unnecessary cosmetic genital surgeries on [[intersex ]] infants and children.<ref name="Patel">{{REFnews

}}</ref> They also argued that being raised to define oneself as disordered is psychologically harmful to [[intersex ]] youth:

In 2012, Viloria spearheaded the first unified, global call for [[human rights]] by and for [[intersex ]] people, in a letter signed by thirty leading intersex advocacy organizations, to the Office of the United Nations High Commissioner for Human Rights.<ref>{{REFweb

In 2013, Viloria served as one of three [[intersex ]] co-organizers of the Third International Intersex Forum in November 2013, in Malta, which led to the creation of the Malta declaration, the most widely agreed upon statement of [[human rights]]' demands by the international intersex advocacy community.<ref>{{REFweb

In 2016, Viloria became a board member of [[Genital Autonomy America]] (GA America), an advocacy organization working with groups worldwide who are seeking to end non-therapeutic genital cutting of all female, male, and [[intersex ]] infants and children.