Mathez, Edmond A.

Edmond A. Mathez is curator of petrology in the Department of Earth and Planetary Sciences at the American Museum of Natural History and was chief curator of the Hall of Planet Earth. He is the editor of "Earth: Inside and Out" and "The Encyclopedia of Gemstones and Minerals,"

James D. Webster is curator of mineral deposits in the Department of Earth and Planetary Sciences at the American Museum of Natural History and was associate curator of the Hall of Planet Earth.