Shallah was one of the original founding members of the PIJ and since 1995 has been the secretary-general and leader of the organization, which is headquartered in Damascus, Syria.
Shallah wuxuu ka mid ahaa dadkii ugu horreeyay ee aasaasay PIJ wuxuuna tan iyo 1995-kii ahaan jiray xoghayaha guud iyo hoggaamiyaha ururka, oo uu saldhigoodu yahay Damascus, Syria.