Our Management Team

Des FitzGerald


Director, General Manager

Des FitzGerald is the Managing Director and principal owner of Intrepid Geophysics (IG) (formerly Desmond Fitzgerald & Associates Pty Ltd). Des founded the company in 1978 as an independent consultancy specializing in the use of computer methods for mining and geophysics. He also co-founded MINDATA, (specialized Mining Research & Development Company) and was Chairman of that company for 14 years.

Des has over 30 years’ experience with Intrepid Geophysics. His major projects have included: the development of the Intrepid geological processing system (software) with Geoscience Australia (GA); a complete compilation of Australian regional geophysical maps (both on shore and offshore) for magnetics, gravity, and bathymetry in partnership with Geoscience Australia (GA); and liaising with the French Geological Survey to further develop and promote new technology for 3D Geological mapping (3D GeoModeller) software integrated with potential field geophysics.

Des holds a PhD in Mining Engineering from the University of Melbourne (Australia). He is a Director for Spatial Vision, a Director for RMIT Innovations Ltd, and the Chairman of GeoJAG. He is also a member of the Australasian Institute of Mining and Metallurgy (AIMM), Australian Industry of Petroleum (AIP), Mineral Industry Consultants Association (MICA), Society of Exploration Geophysicists (SEG), and the Australian Society of Exploration Geophysicists (ASEG). Des is based in Melbourne, Australia.

Greg Walker


Principal Geophysicist and Manager GeoIntrepid

Greg is responsible for GeoIntrepid Solution Services which includes the 2.5D Airborne EM Inversion processing service and the GeoModeller 3D modelling service.

Greg has over 30 years’ experience in the resources sector. He completed his BSc (Hons) at the University of Sydney and had his grounding in geophysics at the Bureau of Mineral Resources (now Geoscience Australia) in Canberra. He then spent six years with Aberfoyle Resources working on base metal projects in Australia and Indonesia.

Greg joined BHP in 1995 and spent 17 years with the company based in Melbourne, Cape Town, Moscow and Singapore working on a range of projects across all commodities on 5 continents. He also led the team interpreting FALCON data from the 4 systems on worldwide projects and later managed the global geophysics function for the Minerals Exploration group.

Greg has specialised expertise in the interpretation of airborne gravity gradiometry and airborne electromagnetics data. He has broad multi-commodity experience and has been involved in all stages of resource exploration ranging from province evaluation, target generation, prospect stage, feasibility, brownfields, and in-mine exploration.

Difu Wang


Senior Developer

Difu Wang is an experienced JavaSE / JavaEE and application developer and now works for Intrepid Geophysics (IG) as a Java developer. Difu joined IG in Apr 2008 as he moved into Australia with his family as permanent residents. In IG he mainly focuses on the development of 3D GeoModeller software and the integration of GeoModeller and Intrepid technologies.

Difu has over 12 years of experience on commercial software development. Before joined IG, Difu had worked as a software developer then a senior software developer and project manager for Singlee Group for 4 years, serving the financial sector. Then he had worked for Siemens for two years focusing on the design and development of distributed applications for Tele-communication industry. His previous major projects include two real-time OLTP systems for financial customers, based on J2EE technologies and two distributed applications for TETRA project inside Siemens.

Difu holds a B.Eng. majoring in Computer Science and Technology from Jiang Su University (China). He also holds Sun Certified Java Programmer and Sun Certified Web Component Developer from Sun Microsystems (now part of Oracle). Difu is based in Melbourne, Australia 

Rod Paterson


Senior Geophysicist

Rod has been with Intrepid since 2007. He is a multi-skilled geoscientist with 30 years’ experience in mining and exploring for tin, base metals, gold and heavy mineral sands. He holds a B.Sc in Geology and Geophysics and has proven analytical ability in the fields of geology, geochemistry, geophysics and remote sensing and a successful track record in ore resource/reserve estimation with experience in a wide range of commodities.

Rod has demonstrated skills in the integration of multidisciplinary data in geographic information systems or image processing environments as well as the processing of ground and airborne magnetic and radiometric and other remotely sensed data. He also has many years of experience in software design and development with a strong focus on robust and user friendly interfaces. Rod is a highly motivated self-starter with excellent long term vision in exploration research and a proven record in report writing.

Evren Pakyuz-Charrier

Product Manager

Evren Pakyuz-Charrier holds a MSc in Geology from Orleans University where he worked on the design of the Cell Based Associations algorithm, the basis of an innovative mining predictivity method.

He has recently completed his PhD studies at UWA on 3D geological modelling uncertainty estimation.

His interest in implicit 3D geological modelling and geostatistics made him an early user of the GeoModeller API. He collaborated with IG to improve the API and further his own research work.

Evren joined IG early 2018 as Geology Product Specialist with a focus on continuous improvement of the modelling engine and user experience.

His research interests and skills range from geostatistics to GIS, geological 3D modelling, spatial analysis, mining predictivity, potential field geophysics and coding.


Rainer Wackerle

Manager, GeoIntrepid Namibia

Rainer Wackerle holds a Diploma (MSc. Equivalent) in Applied Geophysics from the Technical University of Berlin. He started his career at the "Büro für Geophysik” in 1990 performing environmental and engineering geophysical consulting in the area of Berlin and the former German Democratic Republic. This included waste disposal investigation, detection of hazardous waste, detection of UXOs and ground water investigation.

From 1993 to 1996 he worked as an exploration geophysicist with the ‘Mineral Prospecting Promotion Project’ of the Federal Institute for Geosciences and Natural Resources (BGR) seconded to the Geological Survey of Namibia. In this role he participated in the compilation of the Namibian regional airborne magnetic survey data.

In 1997 Rainer joined the Geological Survey of Namibia where he held the position of Senior, later Chief geophysicist. During this time he was responsible for the geophysical activities of the Survey, including quality control of more than 4.5 million line-km of airborne geophysical surveys and supervision of the seismological and magnetic observatories operated by the Survey in co-operation with other institutions.

In 2009 he established GeoIntrepid Namibia where he is currently the Manager. GeoIntrepid Namibia provides a range of services including gravity, magnetic and radiometric data processing, data compilations, quality control (QC), image processing and interpretation of ground, marine and airborne geophysical data, satellite imagery and hyperspectral data.