Stephen Richard is an independent contractor working from Tucson Arizona. He is currently involved in projects developing a cross-domain metadata scheme for describing physical samples (SESAR, iSamples0, metadata for the Deep-time Digital Earth (DDE) program, the CODATA Cross-Domain interoperability framework, and vocabularies and metadata for Astromaterials data. Interests include tectonics, geochronology, interoperable network services for geoscience information (e.g. GeoSciML), use of standardized metadata to streamline data discovery and evaluation, geologic mapping and knowledge representation, implementation of ISO standards, schema.org and other metadata schemes for resource documentation, and development of geoscience vocabularies.