Dr. Ing. Karsten Beckhaus
BAUER Spezialtiefbau GmbH, Germany

Univ.-Prof. Dr.-Ing. Conrad Boley
Bundeswehr University Munich, Boley Geotechnik GmbH - Germany

Donald A. Bruce - Ph.D., C.Eng., L.G., L.E.G.
Geosystems, L.P. - USA

Michael Byle
Tetra Tech Inc., USA

Mikael Creütz, M.Sc.
WSP - Sweden

Trent L. Dreese, P.E.
Gannett Fleming - USA

Dipl.-Ing. Patrick Gabriel B.Sc.
Züblin Spezialtiefbau GmbH, Vienna - Austria & Ed. Züblin AG, London – UK

Raffaella Granata
Trevi S.p.A. - Italy

Hans-Olav Hognestad
UTT Mapei - Norway

Professor Stephan Jefferis
Environmental Geotechnics Ltd., University of Oxford - England

Christophe Justino M.Sc. (Eng.)
Soletanche Bachy - France

Maren Katterbach, M.Sc., M.Eng.
Lombardi Engineering Ltd., MeduSoil - Switzerland

Scott Kieffer - Ph.D., P.E., C.E.G.
Graz University of Technology - Austria

Wolfgang Kühner
Keller Grundbau GmbH - Germany

Dipl.-Ing. Clemens Kummerer
Keller Grundbau GmbH - Austria

Phillip Maroschek, M.Sc.
eguana GmbH - Austria

Devon Mothersille, B.Eng. (Hons), Ph.D., C.Eng., FICE
Geoserve Global Ltd., Single Bore Multiple Anchor Ltd. - England

Robert Penczek, Ph.D.
DSI Underground Chemicals - Poland

Giovanni Spagnoli, Ph.D.
DMT Group - Germany

Meik Weickenmeier, Ph.D., Dipl. Chem.
WEBAC-Chemie GmbH, Germany

Karsten Beckhaus, Dr. Ing. (BAUER Spezialtiefbau GmbH, Germany) has been involved in the Deep Foundation Industry for 19 years and has been working in the structural engineering business for more than 25 years.  Karsten obtained his University degree in Civil Engineering, and later his doctoral degree, from the Technical University in Munich, Germany.  He is now Technical Director and responsible for the Services Division which assists BAUER’s projects worldwide, in specialist technical consulting, design, logistics and equipment tasks. He also serves on Bauer’s Member of the Management Board.
Karsten also works on standardization, in particular for standards on design and execution of special geotechnical works, with special focus on quality and sustainability. Currently, Karsten chairs the joint Concrete Task Group of EFFC an DFI, working at Guidelines for Concrete for Piled Foundations, D-Walls and others. He’s also chairman of the Working Group for revision of European Norms for the Execution of Bored Piles and Diaphragm Walls (EN 1536 and EN 1538), and is involved in the current revision of the EN  14679 on Deep Mixing.

Univ.-Prof. Dr.-Ing. Conrad Boley (Bundeswehr University Munich, Boley Geotechnik GmbH - Germany) is holder of the Chair for Soil Mechanics and Foundation Engineering at the University of the Federal Armed Forces in Munich, and managing partner of Boley Geotechnik GmbH Consulting Engineers (Munich - Stuttgart – Salzburg).
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Donald A. Bruce - Ph.D., C.Eng., L.G., L.E.G. (Geosystems, L.P. - USA) is a leading independent expert in geotechnical construction, with a focus on drilling and grouting techniques, anchors, micropiles, deep mixing, cut offs and in- situ reinforcement. Over his 40-year career Dr. Bruce work has spanned 5 continents. Prior to consulting and teaching in the field of ground engineering, Dr. Bruce worked for major international grouting contractors on all types of geotechnical construction projects including dam cut-offs, dam remediation, tunnel grouting, mine remediation and ground improvement projects. To date, he has been involved with the design or construction of cut-offs or grouted remediation works for over 100 dam projects. His role in these projects varies from member of panel of experts or peer reviewer to consultant to either the designers or the contractors. Dr. Bruce is the author of over 300 technical papers and articles, and has authored and edited several books on ground engineering techniques, including Specialty Construction Techniques for Dam and Levee Remediation, and Dam Foundation Grouting.
Dr. Bruce is the president and founder of Geosystems L.P., offering advisory services in the practical and business aspects of specialty geotechnical construction. He is also the founding Partner of the Geo-Trust Network (https://geotrustnetwork.com/). Dr. Bruce is the recipient of numerous prestigious professional awards including ASCE’s 2004 Wallace Hayward Baker Award and 2015 Karl Terzaghi Award.
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Michael Byle – , P.E., D.GE., F. ASCE (Tetra Tech Inc.) is Senior Consultant for Tetra Tech, Inc. Mr. Byle has more than 40 years of experience in grouting and has completed investigations, design, and execution of grouting projects of all types. He has developed grouting for dams, ground stabilization, underpinning, mining, karst hazard mitigation, transportation and military projects. He has served as a subject matter expert for permeation grouting, compaction grouting, low mobility grouting, jet grouting, and chemical grouting projects, including projects involving multiple grout materials and methods.  Mr. Byle has held a variety of positions within ASCE organizations including: Chair of Grouting Committee, member and Interim chair of the Technical Coordination Council, Chair of Education Task Force of the Geo-Institute, as well as chair of the 2003, 2012, 2017 Grouting Conferences.  He is a founder and past president of the International Conference Organization for Grouting (ICOG). Mr. Byle obtained his Bachelor of Science in Engineering with a Geotechnical specialty from the University of Michigan and a Master of Science in Engineering with a Geotechnical concentration from the Rackham School of Graduate Studies at the University of Michigan.  He has authored more than 30 technical articles on grouting, karst, and specialty engineering
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Mikael Creütz, M.Sc. (WSP- Sweden) specializes in Foundation Engineering and Rock Engineering. Mikael started his career as a technical consultant in 1995 which now means he has numerous years of experience related to design and execution of foundation works and rock works. For half of his career, Mikael has served as technical site supervisor, including major grouting works for cut-off walls in Stockholm, Sweden.
Mikael was responsible for implementing Scandinavian rock fissure grouting practice in Singapore for curtain grouting below secant pile and diaphragm walls for Bukit Panjang Station as a part of the new Down Town Line 2. In 2014 he was awarded the Swedish “Golden Pile” prize for his most significant contributions to the Swedish foundation industry, and since 2016 he has served as a grouting specialist for the Stockholm bypass project, which includes 55 km of rock tunneling.
Present grouting works includes rock fissure grouting for 14 km of hard rock TBM-tunneling below the city of Stockholm. The tunnel diameter is 5 m, and the maximum tunnel depth will be roughly 100 meters as well as grouting design the extension (PSU) of the existing SFR (Final Repository for Short-lived Radioactive Waste in Forsmark, Sweden. The new rock vaults in the extension will be about 120 m below the bottom of the sea.  
Mikael is involved in several rock fissure grouting research projects as well as he is writing papers about grouting works and presenting them around the world. He is a Board Member of the Swedish Association for Foundation Engineering (SAFE), where he is also involved in the education of contractors to become qualified in performing foundation works.
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Trent L. Dreese, P.E. (Gannett Fleming - USA) is Senior Vice President and Geotechnical Dams and Hydraulics Business Line Director for Gannett Fleming Inc. and is based in their corporate headquarters in Harrisburg, Pennsylvania. Drawing on more than 30 years of technical and management experience, Trent has an incredible breadth of knowledge and experience in dam design and rehabilitation projects. He directs the technical, business, and research activities associated with the firm's Grouting Specialty Services, including management of groundwater modeling, seepage modeling, and grout curtain design.
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Dipl.-Ing. Patrick Gabriel B.Sc. (Züblin Spezialtiefbau GmbH, Vienna - Austria & Ed. Züblin AG, London – UK) is project manager within the ground engineering subdivision of Ed. Züblin AG. He has done almost nothing else in life but grouting. His Bachelor’s and Master’s theses focused on quality assurance for permeation grouting and stop criteria in rock grouting. He continued his career with grouting of porous mass concrete on a dam sealing project in Ireland, grouting and ground freezing works in the floating rock mass of a geological fault zone at the Albulatunnel in Switzerland and several grouting projects with horizontal jet-grouting, compensation grouting and cut-mix-injection in Austria, Germany, Switzerland, Ireland and the United Kingdom. After developing the design for compensation grouting works on the High Speed 2 from London to Birmingham he is now ground engineering project manager on one of the largest infrastructure projects northern England with D-Walls, tension piles, soil stabilisation with dry deep mixing and jet-grouting at Kingston Upon Hull.
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Raffaella Granata (Trevi S.p.A. - Italy) joined Rodio S.p.A. (a historical leading company in Special Foundation Works and Soil Improvement) 35 years ago, where she was responsible for the Geotechnical Laboratory and served as Senior Engineer at the Technical Department. Since 2004 Raffaella has been with Trevi S.p.A. as Senior Technical Advisor at the Design, Research & Development Department, where she is the Lead Specialist for Soil and Rock Grouting. Over the years, she has worked in Europe and Overseas on a number of geotechnical construction projects including tunnels, building and dam foundations, and confinement of polluted areas. Since 1992 she is member of the TC288 for preparation/revision of the European Standards on Grouting and Deep Mixing. As member of the EFFC/DFI Task Groups, she cooperated for the preparation of the Guides “Tremie Concrete” and “Support Fluid“ for Deep Foundation.
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Hans-Olav Hognestad (UTT Mapei - Norway) is the business development manager for injection and consolidation at UTT Mapei and is headquartered in Norway. Hans is a recognized international authority concerning grouting of underground structures, and over his 30+ year career, he has tackled extremely challenging situations involving high water pressures and massive tunnel inflows.
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Prof. Stephan Jefferis (Environmental Geotechnics Ltd., University of Oxford - England) has over 45 years’ experience in the design and application of grouts and of excavation of support fluids for cut-off walls, piling, diaphragm walling and slurry tunnelling. More generally, his experience is focused on the investigation and resolution of unusual materials, groundwater and environmental problems associated with grouts, slurries and other geomaterials. He has worked extensively and internationally on the performance and durability of these materials in complex and aggressive environments; application of chemical and cementitious grouts for ground modification, radioactive and toxic waste solidification and for off-shore and on-shore structural applications. He has developed cement-bentonite slurries for cut-off walls across the world.
Professor Jefferis is the director of Environmental Geotechnics Ltd., a company he founded in 1982, as well as visiting professor in the Department of Engineering Science at the University of Oxford and a former chair of the British Geotechnical Association (BGA). He is also a Partner of the of the Geo-Trust Network (https://geotrustnetwork.com/). Professor Jefferis was a lead author for the UK National Specification for the construction of slurry trench cut-off walls as barriers to pollution migration, co-editor of a book on structural grouts and author of many other publications on cementitious systems. In 2022 he presented the BGA 60th Rankine lecture on ‘The Unusual and the Unexpected in Geotechnical Engineering: Observation – Analogy – Experiment’.

Christophe Justino M.Sc. (Eng.) (Soletanche Bachy - France) is the manager of the materials department at Soletanche Bachy. He has nearly 20 years of experience focused on materials for geotechnical works on an international scale. The scope of Christophe’s works ranges from concrete technology, designing grout materials and drilling fluids, deep foundation works, and providing technical assistance and expertise. He is an active member of French federation for civil works at the material committee and chairman of the support fluid task group at the EFFC (European Federation of Foundation Contractors).
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Maren Katterbach, M.Sc., M.Eng. (Lombardi Engineering Ltd., MeduSoil - Switzerland) is a consulting engineer with Lombardi Engineering Ltd. in Switzerland. Maren has been involved in a variety of projects, including underground construction, foundation stability, dam construction, and safety assessments. Within the framework of various dam projects in Europe, Africa, Latin America and Asia, she has provided expertise in the roles of consultant or designer for major dam foundation grouting works. Maren combines geological knowledge with engineering requirements, with the goal of further improving grouting technology based on the GIN approach, originally developed by Lombardi and Deere. Maren also serves as the CTO of Medusoil, a company offering patented bio-cementation technology for producing effective and environmentally friendly injection solutions.
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Scott Kieffer - Ph.D., P.E., C.E.G. (Graz University of Technology - Austria) specializes in developing design solutions for challenging conditions in underground construction, rock slope engineering and dam construction and rehabilitation. He has filled key design roles on major underground transit and water resources projects, and has provided engineering geologic and geotechnical consultation for the siting, construction and rehabilitation of large dams in Europe, Central America, Africa, Asia and the United States. Professor Kieffer is a Professional Civil Engineer, Certified Engineering Geologist, and Professional Geologist with over 30 years of consulting and applied academic experience. In 2007, he was appointed Professor and Chair of Engineering Geology at the Graz University of Technology in Austria, where he also acts as the Civil Engineering Faculty Vice Dean and Head of the Institute of Applied Geosciences. He is the author of more than 80 technical papers and articles, and serves as independent geotechnical consultant concentrating in the areas of rock engineering, ground improvement, alpine geologic hazards and remote sensing. He is also a Partner of the of the Geo-Trust Network (https://geotrustnetwork.com/).
Since 2004, Professor Kieffer has been Director of the renowned Grouting Fundamentals & Current Practice short course in the USA (Colorado School of Mines, Univ. Texas Austin, Phoenix) and Europe (Bundeswehr Univ. Munich).
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Wolfgang Kühner (Keller Grundbau GmbH – Germany) started his career at Keller Grundbau GmbH in 1988 as site engineer. For many years Wolfgang served as the branch manager of the Munich office and is now managing the entire Bavarian region of Germany. Wolfgang is a specialist concerning jet grouting and is involved in many specialty projects of Keller Grundbau throughout Germany and Europe.

Dipl.-Ing. Clemens Kummerer (Keller Grundbau GmbH - Austria)
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Phillip Maroschek, M.Sc. (eguana GmbH - Austria)
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Devon Mothersille, B.Eng. (Hons), Ph.D., C.Eng., FICE (Geoserve Global Ltd., Single Bore Multiple Anchor Ltd. - England) is the Managing Director of two specialist ground anchor consultancies; Geoserve Global Ltd and Single Bore Multiple Anchor Ltd, through which he provides consultancy services to clients across 5 continents. He acts as an expert witness on legal cases related to ground anchor technology and is an active member of committees tasked with the implementation of Eurocode 7, covering the design, execution and testing of ground anchors. He is currently the convenor to Working Group 3, engaged to revise EN ISO 22477-5 (testing of ground anchors), Chairman of the UK Ground Anchors Panel and technical author for the revision of the British Code of practice for Ground Anchors. In 2013 his contribution to the industry was recognized when he was awarded the Fellowship of the Institution of Civil Engineers. Dr. Mothersille is also a Partner of the of the Geo-Trust Network (https://geotrustnetwork.com/).
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Matthias Ohnesorge (Sika Services AG, Switzerland) serves as Corporate Product Engineer for Sika Services AG, maintaining responsibility for injection resins for masonry, concrete rock and soil. His professional experience spans over 20 years, involving development, manufacturing and distribution of construction chemicals worldwide.

Robert Penczek, Ph.D. (DSI Underground Chemicals - Poland) Dr. Penczek has over 10 years of experience with organic resins for ground consolidation and stabilization, water stopping, sealing, void filling and anchoring. His main field of interest and expertise is the chemical and physical nature of the resins (polyurethane, silicate, and acrylic) and their effects on application efficiency and the environmental. Dr. Penczek is a General Manager for DSI Underground Chemicals and runs the leading R&D resin grout lab in Poland.
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Giovanni Spagnoli, Ph.D. (DMT Group - Germany) is Deputy Head for Civil and Mining Engineering at DMT, where he is responsible for the geotechnical unit and second-in-charge for the CME division in Essen, Germany. Dr. Spagnoli’s interests and expertise include geotechnics, soil mechanics, ground improvement and constitutive modeling of soils and rocks.
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Meik Weickenmeier, Ph.D., Dipl. Chem. (WEBAC-Chemie GmbH, Germany) studied Chemistry at the university of Karlsruhe, where he earned his Ph.D. in polymer chemistry. Dr. Weickenmeier is the Managing Director of WEBAC-Chemie, having over 24 years of experience in the development, production, quality control and distribution of injection materials for the protection, restoration, consolidation and maintenance of construction works.
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