Bradley R. Hacker

Professor Emeritus
Earth Science
Earth Research Institute
University of California, Santa Barbara, CA 93106-9630

Ph.D., University of California, Los Angeles, 1988
M.S., University of California, Davis, 1984
B.S., University of California, Davis, 1982

LASS Facility
Electron Imaging Facility


Bradley Hacker received his BS and MS in Geology from UC Davis in 1982 and 1984, while working for Apple Computer on Macintosh, Apple II and other products off and on from 1978 to 1984 (evidence here). He completed his doctorate in Geology at UCLA in 1988. He then spent eight years as a postdoctoral scholar and research associate at Stanford University, and as a geologist for the US Geological Survey. He joined the UCSB faculty in 1996 and retired in 2021.

  • 2021  Structure & Tectonics Career Contribution Award, Geological Society of America
  • 2020  Norman L. Bowen Award, American Geophysical Union
  • 2015  Jack E. Oliver Visiting Professor, Cornell University
  • 2014–15  NSF GeoPRISMS Distinguished Lecturer
  • 2011  Astor Visiting Lecturer, Oxford University
  • 2010  Fellow, American Geophysical Union
  • 2003–04  Mineralogical Society of America Distinguished Lecturer
  • 2003, 2001  Muckers Coterie Professor of the Year
  • 2001  Fellow, Mineralogical Society of America
  • 2001  Fellow, Geological Society of America
  • 1997  Fellow, Cave Research Foundation


Graduate students

Amy Moser Amy Moser: Direct dating of deformation using titanite. Formation of the Ivrea Zone
Ryan Stoner Ryan Stoner: Calcite U-Pb dating. Crustal foundering and other gravitational instabilities.
Robert Holder Robert Holder (Ph.D. 2018): Geochronology and petrology. U/Th-Pb. Madagascar. Monazite. UHT. Professor, University of Michigan.
Joshua Garber Joshua Garber (Ph.D. 2018): Geochronology, geochemistry and petrology. Lu-Hf, U-Pb. Oman, Norway. Titanite. Postdoctoral scholar, Penn State University.
Madeline Shaffer Madeline Shaffer: Foundering of the Pamir lower crust, U/Th-Pb and trace-element petrochronology.
Forrest Horton Forrest Horton (Ph.D. 2015): Himalaya gneiss dome formation, focused radiogenic heating in southern Madagascar, and fertilization of the Neoproterozoic ocean by mantle-derived phosphorus. Asst Scientist, Woods Hole Oceanographic Institution
Mike Stearns Michael Stearns (Ph.D. 2014): Genesis and Evolution of the Pamir Plateau: A Petrochronologic View. Professor, Utah Valley University.
Robert Holder Robert Holder (M.S. 2014): Monazite Trace-Element and Isotopic Signatures of Ultrahigh-Pressure Metamorphism: Examples from the Western Gneiss Region, Norway. Professor, University of Michigan.
Katherine Spencer Katherine Spencer (M.S. 2011): Exhumation and Melting of the Western Gneiss Region, Titanite U-Pb Geochronology. Geologist, Conestoga-Rovers & Associates
Monica Erdman Monica Erdman (M.S. 2011): Seismic Anisotropy of the Basin and Range Lower Crust. Ph.D., Rice University. Editor, US Geological Survey.
Adam Ginsburg Adam Ginsburg (M.S. 2011): UHP Tectonism of the Western Gneiss Region, Zircon U-Pb Geochronology. Geologist, Campbell Geo, Inc.
Steven Arauza Steven Arauza (M.S. 2011): Assessing Rates and Episodes of Ultrahigh-Pressure Metamorphism Through Lu-Hf and Sm-Nd Geochronology
Jen McGraw Jen Schmidt (née McGraw) (M.S. 2010): Exhumation Depths of the Lower Crustal Domes of the Pamir
Ph.D., Lehigh University. Visiting Assistant Professor, Bucknell University.
Emily Peterman Emily Peterman (Ph.D. 2009): The Development and Use of Monazite and Garnet Geochronology with Application to Tectonic Processes, Professor, Bowdoin College.
Nicolas Barth Nicolas Barth (M.S. 2008): Strain within the Ultrahigh-Pressure Western Gneiss Region of Norway Recorded by Quartz LPOs.
Professor, University of California, Riverside.
Andrew KylanderClark Andrew Kylander-Clark (Ph.D. 2008): Slow Subduction and Exhumation of a Thick Ultrahigh-Pressure Terrane: Western Gneiss Region, Norway. Director of the Laser Ablation Split Stream Facility, UC Santa Barbara.
Scott Johnston Scott Johnston (Ph.D. 2006): Evolution of the Nordfjord-Sogn Detachment Zone and the Exhumation of Norwegian ultrahigh-pressure rocks. Professor, Cal Poly, San Luis Obispo.
Josh Cole Joshua Cole (M.S. 2006): Fault-Zone Deformation and Strain Partitioning at the Brittle-Ductile Transition, SEMP Fault, Austrian Alps. Heliskiing guide, Washington.
Matt Rioux Matt Rioux (Ph.D. 2006): The Growth and Differentiation of Arc Crust: Temporal and Geochemical Evolution of the Accreted Talkeetna Arc, South-Central Alaska. Researcher, University of California, Santa Barbara.
David Young Dave Young (Ph.D. 2005): Amphibolite to Ultrahigh-Pressure Transition in Western Norway.
Professor, Ohio State University.
David Root David Root (Ph.D. 2003): Zircon Geochronology of ultrahigh-pressure eclogites and exhumation of the Western Gneiss Region, southern Norway.
Emily Walsh Emily Walsh (Ph.D. 2003): Exhumation of the Ultrahigh-Pressure/High-Pressure Terrane of the Western Gneiss Region, Norway. Professor, Cornell College.
Luc Mehl Luc Mehl (M.S. 2002): Arc-parallel flow within the mantle wedge: Evidence from the accreted Talkeetna arc, south central Alaska. Instructor, Alaska Pacific University

Postdoctoral Researchers

Guillaume Bonnet (2019-20)
Daniel Viete (2013-14) Professor, Johns Hopkins University
Hans Vrijmoed (2010-11) Researcher, ETH Zurich
Sarah Brownlee (2010-11) Professor, Wayne State University
Stacia Gordon (2009-10) Professor, University of Nevada, Reno
Jeremy Hourigan (2004-05) Professor, University of California, Santa Cruz
Martin Robyr (2003-04) Researcher, University of Lausanne
Mary Leech (2001-03) Professor, University of California, San Francisco
Edwin Gnos (1995-96) Curator, Museum d'histoire naturelle de Geneve/University of Geneve

Extramural Grants

  • NSF: ExTerra Field Institute and Research Endeavor (E-FIRE)
  • NSF: Madagascar - What Causes UHT Metamorphism: Lengthscales and Timescales
  • NSF: Collaborative Research: Characterizing and Modeling Crustal Recycling
  • NSF: Acquisition of a Thermal Ionization Mass Spectrometer (TIMS) for high-precision isotopic research of the Earth’s mantle, crust and oceans
  • NSF, 2015-2017 Collaborative Research: Did the Pamir gneiss domes and salient form by northward underthrusting of India or southward subduction and rollback of Asia?
  • NSF, 2013-16 Collaborative Research: the role of fluids in intermediate-depth seismicity and wedge anisotropy: Case studies for Cascadia and Alaska, with a comparison to Japan
  • NSF, 2009-12, Testing channel-flow models using mid-crustal rocks of North Himalayan gneiss domes
  • NSF, 2011-15, What determines whether the deep continental crust flows?
  • NSF, 2011-15, Collaborative Research: The suturing process: Insight from the India-Asia collision zone
  • NSF, 2009-12, How Does the Lower Crust Thicken and Grow During Continent Collisions? A Case Study of the Pamir
  • NSF, 2007-12, Collaborative Research: How Is Rifting Exhuming the Youngest HP/UHP Rocks on Earth?
  • NSF, 2009-12, The Dynamics of UHP Tectonism: Does the Western Gneiss Region Consist of Multiple (U)HP Blocks With Different Histories?
  • NSF, 2009-11, MRI: Acquisition of an Electron Microprobe for UCSB Researchers and Educators
  • NSF, 2008-10, Collaborative Research: Using Mineral Physics to Interpret Seismic Anisotropy of Basin & Range Crust
  • NSF, 2006-09, Collaborative Research: Melt Extraction from UHP Metasediments: Evidence and Consequences
  • NSF, 2006-09, Collaborative Research: EarthScope integrated investigation of Cascadia subduction zone tremor, structure and process
  • NSF, 2007-08, Acquisition of a New Electron-Imaging Facility.
  • NSF, 2006-07, Support for the Penrose Conference on Arc Crustal Genesis and Evolution; July 9-15, 2006; Valdez, Alaska
  • NSF, 2005-08 The Assembly of UHP Terranes: Was the Western Gneiss Region, Built By Sequential or Repeated (Ultra)High-Pressure Events?
  • NSF, 2003-06, Direct Observation, of Depth Variation, in Fault Zone Structure Through and Below the Seismogenic Crust
  • NSF, 2002-05, Collaborative Research: Thermal, Petrological, and Seismological Study of Subduction, Zones
  • NSF, 2001-05, Subduction, and Exhumation, of Ultrahigh-Pressure Rocks: Field and Drilling Studies in Eastern China
  • NSF, 2000-05, Geology, geochemistry, structure and physical properties of the Talkeetna arc crustal section, south central Alaska
  • NSF, 1999-02, Exhumation, of ultrahigh-pressure rocks in the Scandinavian Caledonides
  • NSF, 1998-01, Collaborative Research: The Thermal, Petrological and Seismological Structure of Subducting Oceanic Lithosphere
  • NSF, 1998-00, Collaborative Research: Petrotectonic Study of Ultrahigh-Pressure Rocks from the Kokchetav Massif, Northern Kazakhstan, and the Maksyutov Complex, South Ural Mountains, Russia
  • NSF, 1998-99, Collaborative Research: Structure of the Crust and Upper Mantle Beneath the Tibetan Plateau Interior.
  • NSF, 1995-98, Exhumation of Ultrahigh-Pressure Rocks in the Dabie Mountains, Central China.
  • Department of Energy, 1993-96, Experimental Investigation, of Kinetics and Rheology During Diagenesis.
  • Petroleum Research Foundation, 1993-95, Experimental Investigation, of Kinetics and Rheology During Diagenesis.
  • NSF, 1992-96, Formation of the Sole of the Oman Ophiolite.



See Supplementary Data tables for additional data relating to articles published or in press.

Ultrahigh-Pressure Tectonics

Exhumation of orogen-scale coesite-, diamond-, and former-majorite bearing terranes that formed by subduction of continental crust to depths >100 km.

Timescales and Rates of Orogenic Events
Rates of exhumation and timescales of orogenic processes.

176. Viete, DR., Hacker, B.R,, Allen, MB, Seward GGES, Tobin, MJ, Kelley, CS, Cinque, G, Duckworth, AR, 2018. Metamorphic record of multiple seismic cycles during subduction. Science Advances doi: 10.1126/sciadv.aaq0234

Subduction Zones: Physical properties, seismicity, and seismic anisotropy
Phase transformations, deformation, fluid flow, and intermediate-depth seismicity in subduction zones.
seismicity & fluid flow Cascadia dVp sub-arc H2O

Phase Transformations and Rheology
Rates and mechanisms of simple geological phase transformations and mechanical behavior of rocks.
Warnsdorfer glacier

Analytical Method Development

Development of LASS (laser-ablation split-stream ICP mass spectrometry), electron-backscatter diffraction, and rock physical-property calculation methods.

ICP torchEBSD map

Other Publications

  • Hacker, B.R. (editor), 1998, Caves of Gunung Buda 1997. Good Earth Press, Santa Cruz, CA, 65 pp.
  • Hacker, B.R. (editor), 1996, Caves of Gunung Buda. Good Earth Press, Santa Cruz, CA, 55 pp.
  • Rose, C., Hacker, B.R., Anders, R., Withey, K., Metzler, M., Chernicoff, S., Espinosa, C., Averill, A., Davis, B., and Howard, B., 1985, Inside Macintosh Volume I: Reading, Massachusetts, Addison-Wesley, 550 p.
  • Rose, C., Hacker, B.R., Anders, R., Withey, K., Metzler, M., Chernicoff, S., Espinosa, C., Averill, A., Davis, B., and Howard, B., 1985, Inside Macintosh Volume II: Reading, Massachusetts, Addison-Wesley, 429 p.
  • Rose, C., Hacker, B.R., Anders, R., Withey, K., Metzler, M., Chernicoff, S., Espinosa, C., Averill, A., Davis, B., and Howard, B., 1985, Inside Macintosh Volume III: Reading, Massachusetts, Addison-Wesley, 281 p.
  • Hacker, B.R., 1983, Apple /// Pascal Technical Reference Manual: Apple Computer, Inc., Cupertino, California, 168 pp.
  • Hacker, B.R., 1982, Imagewriter User's Manual: Apple Computer, Inc., Cupertino, California, 120 p.
  • Hacker, B.R., 1980, Apple /// Apple Business BASIC Reference Manual: Apple Computer, Inc., Cupertino, California, c. 300 p.
  • Hacker, B.R., 1979, The Silentype Operation and Reference Manual: Apple Computer, Inc., Cupertino, California, c. 100 p.
  • Hacker, B.R., 1978, The Cashier: Apple Computer, Inc., Cupertino, California, c. 100 p.

Some material based upon work supported by the National Science Foundation. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the NSF.