Peter Arthur Fox (5 May 1959 – 27 March 2021) was a data science and researcher at Rensselaer Polytechnic Institute (RPI), United States. He was a Tetherless World Constellation chair and professor of Earth and Environmental Science, Computer Science and Cognitive Science, and director of the Information Technology and Web Science Program at RPI. He was known for defining informatics and data science in earth sciences, bringing Semantic Web research to that community, as well as defining the sun-earth connection research agenda and co-convening the community. Fox was born in Devonport, Tasmania, Australia and resided in Troy, NY, United States until his death on 27 March 2021, at the age of 61.