About Us


randy Randall Mackie - PRESIDENT

Randy is a Research Geophysicist at CGG working with the Multi Physics Imaging group based in Milan, Italy since 2011. Specializing in electromagnetic modeling and inversion, he has been involved in the development of numerical modeling and inversion codes including magnetotellurics (MT), controlled source EM (CSEM), gravity, magnetics, and first arrival seismic travel times for decades. In recent years his efforts have concentrated on the development of robust and practical joint inversion algorithms. Prior to CGG, Randy was working with SLB (2007-2011), and Geosystem (1997-2007), a small geophysical contracting company that was based in Milan, Italy. He received his PhD from MIT in 1991, and his undergraduate degree from CSM in 1984. He has been based in San Francisco since 1997.

veronica Veronica Tribaldos - VICE PRESIDENT

Verónica is a Research Scientist in the Energy Geosciences Division of the Earth and Environmental Sciences Area at Lawrence Berkeley National Lab (LBNL). She obtained her Bachelor's Degree in Geology from the Autonomous University of Barcelona and a joint M.Sc. Degree in Applied Geophysics from TU Delft, ETH Zurich, and RWTH Aachen. In 2018, she received a PhD from the University of Cambridge in which she investigated the spatio-temporal evolution of a large sedimentary basin in northeast Brazil by means of passive and active seismic imaging, subsidence analysis through well-log data and gravity modeling. She then joined LBNL as a postdoctoral researcher to work in the application of fiber-optic sensing for near-surface imaging. Her research focuses on developing and applying seismic approaches to Distributed Acoustic Sensing (DAS) datasets with the goal of understanding the dynamics of subsurface processes for environmental and energy-related applications.

kris Kris MacLennan - SECRETARY

Kris is a Research Geophysicist at the Energy and Environmental Research Center at UND, working remotely from the Bay Area. An Oakland native, Kris did his undergraduate at UC Berkeley (2006), followed by a PhD in Geophysics at CSM (2013). Kris participated in SAGE in 2005 as an undergrad and returned in 2014 as a TA and credits his experience there with fueling his desire to be an applied geophysicist. Kris worked for GroundMetrics, Inc. in San Diego from 2014 to 2020, split between field surveys and research projects on EM exploration and monitoring. Most recently he organized the EM and Reservoir Surveillance sessions at SEG’s annual meeting. Professional interests include utilizing geophysics, especially non-seismic and electrical/electromagnetic methods, for hydrological, environmental, geothermal, exploration, and carbon sequestration challenges; project and team management; grant and proposal development; and scientific communication.

sierra Sierra Boyd - TREASURER

Currently Sierra ensures data quality and station support at the Berkeley Seismology Lab. As a geophysicist she worked at Norcal Geophysical Consultants and Lawrence Livermore National Laboratory. After graduating with a B. S. (1985) and M. Eng. (1987) in Applied and Engineering Physics, Cornell University, Sierra worked as a wireline field engineer for Schlumberger Inland Services, UK. She later pursued a M. S. (2000) in Materials Science and Mineral Engineering, and Ph. D. (2018) in Earth and Planetary Science, UC Berkeley.

mike Mike Wilt - PAST PRESIDENT

Michael has had a long career in bay area geophysics working at both Lawrence Berkeley and Lawrence Livermore National Labs, for Electromagnetic Instruments Inc. in Richmond, and for Schlumberger in their technology centers in Richmond and Berkeley. He received his B.S. (1973) and M.S. (1975) in Geophysics from UC Riverside and his PhD from UC Berkeley in 1991 in applied geophysics. At present he works part time at Lawrence Berkeley Laboratory doing research in EM methods.