James Gregory "Greg" Hirth (born June 4, 1963) is an American geophysicist, specializing in tectonophysics.
[3] Greg Hirth as a boy and teenager enjoyed the outdoors in the woods of Ohio and the mountains of Colorado.
In the department of Earth, environmental and planetary sciences of Brown University, he was from 2007 to 2009 an associate professor and was appointed in 2010 to a full professorship, which he currently holds.
He has also done geological fieldwork in Central Australia (1993),[2] in the Talkeetna Arc (2000–2002),[6][7] in Norway (2009), and in California's Mecca Hills (2021).
[2] Hirth's 1996 paper Water in the oceanic upper mantle: Implications for rheology, melt extraction and the evolution of the lithosphere, co-authored with David L. Kohlstedt,[8] has been cited more than 1750 times.
[16][17][18] He and his colleagues have used experimental and theoretical rheology in constructing models of the oceanic lithosphere,[19][20] the Iceland hotspot[21] and several other geophysical phenomena.