Jas Holza was a Bajoran politician in exile on Valo III, while Bajor was under Cardassian occupation.
He represented the Bajoran cause to the Federation on several occasions, usually on "symposia or diplomatic soirees". At one symposium, he met Beverly Crusher; she considered him to be a good leader for his people as well as a good dancer.
In fact, however, Holza had no real influence among Bajorans; Ro Laren desribed him as the "token Bajoran" invited to such conferences to give a good picture, but the real power lay with other, not so sustained leaders like Keeve Falor or Orta. (TNG: "Ensign Ro")