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Semantic web services (SWS) provide rich and formal representations of services by capturing the semantics of requests and service descriptions as well as the context of service interactions. Recently, multiple SWS standards such OWL-S, WSMO, and SAWSDL have emerged making service interoperability increasingly a challenge. In order to leverage the true potential of Semantic Web services, this service heterogeneity problem must be overcome. This paper introduces an OWL-S based mediator for service level and data level mediation across heterogeneous semantic service descriptions. We consider WSMO and SAWSDL service description formalisms and present mediation strategies via OWL-S, by converting service descriptions and mapping the underlying core ontology from WSML to OWL. Through experiments, the proposed mediator is found to be promising.