The Society for Ultrastructural Pathology is an international association of electron microscopists, formed in 1986. The academic objectives of the Society are accomplished at the Companion Meeting of the annual United States and Canadian Academy of Pathology meeting and at the biennial Ultrapath conferences. The Society fosters the application of electron microscopy in the diagnosis and research of human diseases. The meetings are an opportunity for the exchange of information, particularly ultrastructural and immunohistochemical, relevant to diagnostic pathology. Members of the Society welcome practitioners of, and those who are interested in, the art and science of electron microscopy. This includes pathologists, residents and registrars in pathology, Ph.D. electron microscopists, electron microscopy technologists, and research scientists.