Current term 2019-2023

22 members have been elected during the business meeting at the IUGG meeting in Montreal, Canada. In addition to the Past-Chair, four of them are elected as officiers representing the IHFC Bureau.

Irina Artemieva, Paolo Chiozzi, Petr Dedecek, Dmitry Demezhko, Andrea Förster, Sven Fuchs, Gianluca Gola, William Gosnold, Valiya Hamza, Robert Harris, Derrick Hasterok, Lijuan He, Shaopeng Huang, Thomas Kohl, Youngmin Lee, Shaowen Liu, Podugu Nagaraju, Raquel Negrete-Aranda, Jeffrey Poort, Sukanta Roy, Akiko Tanaka, Guzel Vakhitova, Massimo Verdoya,


Irina Artemieva

University of Copenhagen
Department of Geosciences and Natural Resource Management,

Lithosphere structure, evolution & geodynamics:

Paolo Chiozzi

DISTAV University of Genoa (Italy)

Paolo Chiozzi received his MSc in Earth Sciences in 1989 and his Ph.D. in Geophysics at the University of Genoa (Italy) in 1995. Since 1996, he has been working on several projects encompassing a wide range of geodynamical and geothermal problems. His research is focused on the relationships between the thermal structure and the deformation processes within the lithosphere. He has developed techniques of spectral analysis of magnetic data to obtain information on the deep magnetic boundary and their relation with the temperature distribution and the Curie point. Moreover, his activity is addressed to the determination natural radioactivity, radiogenic heat production of rocks and underground temperatures. He has published more than 50 papers in international journals about terrestrial heat flow and related issues.

Petr Dedecek

The Czech Academy of Sciences
Department Geothermics,

My research interests cover the entire field of geothermics related to heat flow density study. Recently, I focus namely on comparison of different methods for measuring of the thermal properties of rocks and soils and also on the possibilities of using the Distributed Temperature Sensing systems to measure temperature changes in deep boreholes. Last but not least, I also deal with numerical modeling of subsurface temperature field.

Dmitry Demezhko

Russian Academy of Sciences
Institute of Geophysics, Ural Branch, Yekaterinburg, Russia,

Dr. Dmitry Yu. Demezhko: Graduated Department of Geophysics at Sverdlovsk Mining Institute (1981). Now: Chief Research Scientist at the Lab. of Geodynamics, Institute of Geophysics, Ural Branch of Russian Academy of Sciences. The main scientific interest is the Earths thermal field including: (i) study of the heat transfer process on the earths surface; (ii) paleoclimatic interpretation of borehole temperature data; (iii) development of systems and methods for temperature monitoring in seismically active regions; (iv) study of free thermal convection in boreholes, development of methods for its suppression; (v) study of thermal properties of rocks (mainly thermal effusivity).
Member of Scientific Council on Geothermal Problems in the Russian Academy of Sciences: since 2005; International Heat Flow Commission (IHFC): since 2015

Andrea Förster

Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences
Geosystems - Section Geoenergy, Telegrafenberg, 14473 Potsdam, Germany,

My interests center on the Earths temperature field at lithospheric scale. Parameters of interest are the terrestrial heat flow, the generation of radiogenic heat in the crust and the thermal properties of rocks, such as thermal conductivity and thermal diffusivity. This expertise also is implemented in the exploration of natural geo-energy resources for which the thermal field is characterized at regional as well as local scale. For this purpose geological data from boreholes and surface geophysical surveys as well as data from laboratory studies of rock chemistry and physics are implemented in numerical, geology-assisted subsurface models. Work performed in the past was concentrated on different geodynamic settings in the world, e.g. the North German Basin, the Erzgebirge and Luxembourg in Europe, the North American Midcontinent, the Andean subduction zone in Bolivia and Chile, the Arabian Shield in Israel and Jordan, as well as regions of the Indian continent.

Sven Fuchs

Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences
Geosystems - Section Geoenergy, Telegrafenberg, 14473 Potsdam, Germany,

My research interests focus on the Earths thermal field and its relevance for geodynamic processes as well as for the technological utilization of the subsurface (exploration of resources, geothermal production, geological storage of energy and waste, hydrocarbon generation, etc.). This includes detailed studies of the heat flow evolution and associated rock thermal properties, considering the affecting geoscientific processes across scales and times. For this task, I integrate geological data on various scales with geophysical surveys from boreholes (well-log interpretation) and surface (seismic data) as well as with data from laboratory studies of rock physics and chemistry into numerical models.

Gianluca Gola

National Research Council of Italy (IGG-CNR, profile)
Institute of Geosciences and Earth Resources, Via Giuseppe Moruzzi 1, 56124 Pisa (Italy),

I am interested in the thermal and rheological aspects of the Earth's lithosphere by coupling multiple datasets, from the available geophysical data to the petrological and geochronological information. My research activity includes investigations on thermal petrophysics through laboratory measurements and the processing of borehole geophysical logs, and the numerical modelling of heat and fluid transport phenomena in the subsurface. Since 2012, I am involved in different national and European research projects dedicated to the geothermal exploration and resource assessment in different geological realms.

William Gosnold

University of North Dakota
Harold Hamm School of Geology and Geological Engineering,

William Gosnold is Chester Fritz Distinguished Professor in the Harold Hamm School of Geology and Geological Engineering at the University of North Dakota. Dr. Gosnold's career spans forty-two years of research in heat flow, geothermal energy, tectonics, and climate change. His geothermal energy research in the Williston Basin led to the first commercial demonstration of geothermal power using low-temperature waters in an oil and gas setting. He was a member of the team that developed the United States National Geothermal Data System for the US Department of Energy. He served as chair of the Department of Geology and Geological Engineering (2006-2010) and interim chair of the Department of Petroleum Engineering (2015-2016). He served as Custodian of the Global Heat Flow Database of the International Heat Flow Commission from 2001 until 2019. He is currently Graduate Director for the Harold Hamm School of Geology and Geological Engineering.

Valiya Hamza

National Observatory of the Ministry of Science, Technology and Industry
Rio de Janeiro, RJ, Brazil,

Valiya Hamza received M.Sc. degree in Applied Physics from University of Kerala (1964) and Ph.D. in Geophysics from University of Western Ontario (1973). Has been Professor of the University of Sao Paulo and Research Coordinator of the Institute for Technology Research of the state government of Sao Paulo. Served as Secretary of the International Heat Flow Commission - IHFC and member of the Executive Committee of IASPEI. Associated with activities of the International Heat Flow Commission since 2007 and is Editorial Manager of the International Journal of Terrestrial Heat Flow and Applied Geothermics (IJTHFA). Research interests include analysis of global heat flow, geothermal energy, tectonophysics and climate change of the recent past. Has authored more than 100 publications. Currently, Emeritus Professor in geophysics at the National Observatory of the Ministry of Science and Technology, Brazil.

Robert Harris

Oregon State University
College of Earth, Ocean, and Atmospheric Sciences, Corvallis OR 97331 USA,

Robert Harris received his M.Sc. in 1992 and Ph.D. in 1994, both in Geophysics at the University of Utah (USA). Currently my research interests are in the general area of marine heat and fluid flow. I am currently involved in several projects to better the thermal structure of subduction zone forearc (e.g., Cascadia, Costa Rica, Nankai, New Zealand) and their relationship to earthquakes, slow slip, and other modes of deformation. Other on-going research involves better understanding thermal properties associated with rifting in the Gulf of California and geothermal manifestations of venting with Yellowstone Lake (USA). I am managing the U.S. Academic Heat Flow Capability.

Derrick Hasterok

University of Adelaide
Earth Sciences,

Derrick received a Masters at the University of Utah (2006) focusing on thermal isostasy of North America (contributions of heat to elevation) and continued on to a Ph.D. (2010) extending this work with a focus on distributions of radiogenic heat producing elements. This work showed the importance of temperature controls on continental elevation roughly equal to that of compositional variations. The Ph.D. also involved an in depth look at global patterns of heat loss and hydrothermal circulation through the oceanic lithosphere. He then began a postdoc as a Green's Scholar at Scripps Institution of Oceanography and built an apparatus to measure electrical conductivity at elevated temperatures while continuing to look at heat flow variations at the ocean-continent transistion. His on-going research includes connection to the previous heat flow studies and also new directions involving the interpretation of electrical conductivity variations within the mantle in terms of composition, melts, and volitiles such as water and carbon dioxide.

Lijuan He

Chinese Academy of Sciences
Institute of Geology and Geophysics, Beijing, China,


Shaopeng Huang

Specially Appointed Professor, Shenzhen University, Shenzhen, China,

Shaopeng Huang is an IHFC member since 1995. He has served the IHFC at various capacities such the custodian (1993-1999) of the Global Heat Flow Database, the custodian (since 1993) of the Global Database of Borehole Temperatures for Climate Reconstruction, the webmaster (1993-2005), Vice Chairman (2011-2015), Chairman (2015-2019), and Past Chairman (since 2019). His research interests include heat flow, geothermal energy, subsurface temperature records of climate change, urban thermal environment, and energy budget of the Earth system. In addition to the conventional geothermal topics, one of his ongoing research effort is to track down global climate change by detecting changes in solar radiation into and radiation outgoing from the Earth with a lunar outpost. Shaopeng Huang is an early advocator for a Moon-based observatory for terrestrial radiation and climate change.

Thomas Kohl

Karlsruhe Institute of Technology (KIT)
Division of Geothermal Energy,

Prof. Dr. Thomas Kohl is full professor at Karlsruhe Institute of Technology, KIT. He holds the chair of the Division of Geothermal Energy at the Institute for Applied Geosciences and is head of the topic Geothermal Energy Systems at KIT contributing to the research field "Energy" in the program "Renewable Energies" as defined by the Helmholtz Association.

Youngmin Lee

Korea Institute of Geoscience and Mineral Resources
Geothermal Resources Research Team, Daejeon, South Korea,

Youngmin Lee is a principal researcher of Korea Institute of Geoscience and Mineral Resources (KIGAM). He received his B.S. degree in geology in 1988 and M.S. degree in geophysics in 1990 from Seoul National University. He completed his Ph.D. in geology at the University of Oklahoma in 1999. His research interests include terrestrial heat flow, geothermal energy, coupled heat and fluid flow modeling, thermal conductivity, paleoclimate change inferred from borehole temperatures, and overpressures in sedimentary basins.

Shaowen Liu

Nanjing University, China
168 Xianlin Avenue, Xixia District, School of Geography and Ocean Sciences, Nanjing 210023, China,

My research interests focus on heat flow and thermal structure of continental lithosphere. I integrate temperature logging and thermal properties measurement, with numerical modeling, to investigate the geothermal regime of the sedimentary basins, and thermo-rheological structure of continental lithosphere, covering from the Precambrian cratons in west China to the Cenozoic passive margin of the South China Sea. Besides, I am also interested in some applied geothermal issues, such as the geothermal aspects of the oil, (shale) gas and gas hydrate, and the geothermal effects of contrasting thermal properties on geothermal field within the sedimentary basins.

Podugu Nagaraju

Ministry of Earth Sciences (MoES), Government of India
Borehole Geophysics Research Laboratory (BGRL), Karad - 415 114, Maharashtra, India,

Nagaraju Podugu received his M.Sc. (Tech) Geophysics degree from Andhra University in 2009 and Ph.D. in Geophysics from CSIR-NGRI and Osmania University, Hyderabad in 2015. As a researcher at CSIR-NGRI, he has involved in different projects to construct crustal thermal structure of the Indian shield. He is presently involved in a fascinating project Scientific Deep Drilling in the Koyna Intraplate Seismic Zone, Western India to model the mechanism of reservoir triggered earthquakes. His research interests include thermal structure of the Indian shield and its significance in geodynamic processes, heat flow estimation, radiogenic heat generation, rock thermo-physical properties, effect of porosity on rock thermal conductivity, scientific deep drilling and geophysical well logging.

Raquel Negrete-Aranda

Ensenada Center for Scientific Research and Higher Education
Geology Department, Earth Sciences Division,

Originally involved with the magmatic evolution of volcanic systems, my research interest switched to use thermal processes to understand various geologic processes that involve the transfer of energy. Since heat (energy) and temperature are fundamental to many earth processes, being able to quantify the flow of energy and thermal budgets leads to an appreciation and understanding of Earth dynamics. My research approach focuses on marine heat flow and the modeling of terrestrial processes that involve the thermal state of the lithosphere and its role in influencing geodynamics. There are many fundamental processes that influence and are influenced by heat transport (i.e., thermal evolution of the oceanic crust and lithosphere, geodynamics of plate boundaries, fluid circulation and associated impacts on water-rock interactions, seismicity, tectonics and magmatism) Understanding these processes involve the quantification of energy and fluid fluxes, requiring knowledge of the thermal state deduced from direct observations that include, heat flow, sub-bottom temperature and rock properties.

Jeffrey Poort

Sorbonne University & CNRS
Institute of Earth Sciences in Paris (ISTeP), 4 place Jussieu, 75005 Paris, France,

Jeffrey Poort has received his Ph.D. in Earth Sciences in 2000 (Free University of Brussels VUB) with a thesis on the heat flow of the Baikal Rift. Since then, his research has been focussed on the understanding of the terrestrial heat transfer associated with different processes, from lithospheric scale studies (mainly passive margins) to local fluids migrations. A particular theme of his research is related to gas hydrates, seeps and mud volcanoes. His research has been mainly in offshore environments, including the Black Sea, the Okhotsk Sea, the Mediterranean Sea, the Hikurangi Margin, the Gulf of Cadiz, the Caribbean Sea, Mozambique Chanel, the Mid-Atlantic Ridge and Lake Baikal. He has been working at the VNII Okeangeologiya Institute (St-Petersburg, Russia), Renard Centre of Marine Geology (Gent, Belgium) and IPGP (Paris, France). At this moment he is a research-engineer at the Sorbonne University in Paris where he is heading a platform of marine type heat flow instruments.

Sukanta Roy

Ministry of Earth Sciences, Govt. of India
Borehole Geophysics Research Laboratory, India,

Sukanta Roy is affiliated to the Ministry of Earth Sciences, Government of India (2014-date) and CSIR-National Geophysical Research Institute (1998-date). His primary research interests include heat flow and radiogenic heat production studies, geothermal energy, geothermics of climate change and scientific deep drilling investigations in active fault zones. His recent work includes the successful completion of a 3 km deep pilot borehole and investigations, which provide new insights into the geothermal and geomechanical regime in the Koyna seismogenic zone. Earlier, he completed a Ph.D. in Geophysics (Geothermics) in 1997 and served the Geothermal Studies program of CSIR-NGRI in various capacities. His principal contributions are constraining the thermal structure of Indian shield using geothermal, seismological and geological datasets, building a Geothermal Climate Change Observatory, and exploring geothermal energy potential. He has worked closely with the government, academia and industry towards developing guidelines for a National Geothermal Energy Policy. He was a member of the Science Planning Group on Sustainable Energy for the ICSU-Regional Office for Asia and the Pacific. Besides co-authoring two books, he is Section Editor for the Encyclopedia of Solid Earth Geophysics (Springer). He was awarded the Best Ph.D. Thesis in Geophysics in 1998 and National Mineral Award in 2008. He has contributed to the International Heat Flow Commission as member (2003-2007), Vice Secretary (2007-2011) and Secretary (2011-2019). He is a Fellow of the Geological Society of India, and member of Indian Geophysical Union and Society of Petroleum Geophysicists. He serves the Executive Committee of International Continental Scientific Drilling Program

Akiko Tanaka

Geological Survey of Japan
National Institute of Advanced Industrial Science and Technology, AIST Tsukuba Central 7, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan,

My research interest lies in how a variety of data has uniquely revealed many interesting phenomena including the lithospheric thermal regime and its relevance and implication in geodynamic processes. Recently, my research focuses on relating heat flow studies both on the regional scale, a compilation of database: Thermal Data Collection in and around Japan, and the global scale, the proxy for lithospheric thermal structure.

Guzel Vakhitova

Bashkir State University
Physics and Technical Institute, Department of Geophysics, Ufa, Russia,

Guzel Vakhitova received MSc degree in Physics in 1992 and PhD in Petrophysics at Bashkir State University in 1998.
Dr. Vakhitova has been working on multiple projects associated with reservoir temperature diagnostics based on temperature logging and data processing, thermo-hydrodynamic measurements and numerical modeling since 1998. Her research interests include study of thermal field of the Earth, estimation of heat flow and associated thermal properties of rocks, and evaluation of natural temperature distribution. Her long-term research includes a significant contribution into development of temperature logging technology and methodology of calculation of the natural temperature profiles based on measurements in production wells and numerical modeling.

Massimo Verdoya (Chair)

University of Genova, Italy
DISTAV - Geofisica della Terra Solida, Italy,

Massimo Verdoya received his MSc in Geological Sciences in 1985, and in 1992 his Ph.D. degree in Geophysics. From 1993 to 2014, he worked as a Researcher in Solid Earth Geophysics and thereafter as Associate Professor at the University of Genoa, Italy. His fields of interest are: thermal modeling of lithospheric geodynamical processes, lithosphere rheology and thermal field, applied geothermics, analytical and numerical simulations of heat and groundwater transfer (with special reference to hydrothermal reservoirs), determinations of thermo-physical properties of rocks and soils (thermal conductivity and diffusivity), past climate change inferred from underground temperatures. Member of the the International Heat Flow Commission (2011-2015) and vice-chairman (2015-2019). He is also member of the board of directors of the International Geothermal Association (2016-2020).

Top 5 long-time memberships

  • 36 years, Hamza, Valiya (Brazil, 1975-...-present)
  • 32 years, Cermak, Vladimir (Czech Republic, 1971-2003)
  • 32 years, Uyeda, Seiya (Japan, 1963-1995)
  • 28 years, Clauser, Christoph (Germany, 1987-2015)
  • 24 years, Huang, Shaopeng (USA/China, 1995-present)

All members (1963-present)


  • Alexandrov, A.L. (former USSR, Russia, 1971-1975)
  • Allis, Rick (USA, 1987-1991)
  • Artemieva, Irina (Denmark, 2019-2023)


  • Balling, Niels (Denmark, 1983-1995)
  • Banewell, C.J. (New Zealand, 1963-1967)
  • Beardsmore, Graeme (Australia, 2011-2019)
  • Beck, Alan E. (Canada, 1963-1991)
  • Becker, Keir (USA, 1979-1987)
  • Beltrami, Hugo (Canada, 1999-2011)
  • Birch, Albert Francis (USA, 1963-1975)
  • Bodvarsson, G. (Iceland, 1963-1967)
  • Boldizsar, T (Hungary, 1963-1975)
  • Bullard, E.C. (Great Britain, 1963-1967)
  • Buntebarth, Günther (Germany, 1983-1991)


  • Cermak, Vladimir (Czech Republic, 1971-2003)
  • Chapman, David S. (USA, 1975-2011)
  • Chiozzi, Paolo (Italy, 2019-2023)
  • Clauser, Christoph (Germany, 1987-2015)
  • Clow, Gary D. (USA, 1991-2003)
  • Correia, Antonio (Portugal, 1995-2011)
  • Cull, Jim (USA, 1979-1987)


  • Davis, Earl E. (Canada, 1999-2003)
  • Dedecek, Petr (Czech Republic, 2019-2023)
  • Demetrescu, Crisan (Romania, 2003-2019)
  • Demezhko, Dmitry Yu. (Russia, 2015-2023)


  • Evison, F.F. (New Zealand, 1975-1979)
  • Evrard, Pierre (Belgium, 1963-1967)


  • Förster, Andrea (Germany, 2015-2023)
  • Facca, G.C. (Italy, 1963-1967)
  • Francheteau, Jean (France, 1975-1979)


  • Girdler, R.W. (England, 1971-1975)
  • Gola, Gianluca (Italy, 2019-2023)
  • Gosnold, William D. (Germany, 2003-2023)
  • Gupta, M.L. (India, 1971-1987)


  • Haenel, Ralph (Germany, 1975-1987)
  • Hamza, Valiya (Brazil, 1975-2023)
  • Harris, Robert N. (USA, 2003-2023)
  • Hasterock, Derrik (Australia, 2019-2023)
  • He, Lijuan (China, 2011-2023)
  • Healy, James (New Zealand, 1963-1975)
  • Horai, Ki-iti (Japan, -0)
  • Horvath, F. (Hungary, 1987-1991)
  • Hu, Shengbiao (China, 1999-2011)
  • Huang, Shaopeng (USA/China, 1995-2023)
  • Hurtig, Eckart (Germany, 1975-1991)
  • Hyndman, R.D. (Canada, 1971-1975)


  • Jaeger, J.C. (Australia, 1963-1967)
  • Jessop, Alan M. (Canada, 1963-1979)
  • Joeleth, Argo (Estonia, 2003-2019)
  • Jones, Michael Q. W. (South Africa, 1991-2019)


  • Kinoshita, Masataka (Japan, 1979-1987)
  • Kohl, Thomas (Germany, 2003-2023)
  • Kukkonen, Ilmo T. (Finland, 1991-2015)
  • Kutas, Roman (Ukrain, 1971-1987)


  • Lachenbruch, Arthur (USA, 1971-1987)
  • Langseth, M.G. (USA, 1963-1975)
  • Lee, Youngmin (Korea, 2019-2023)
  • Lee, William H.K. (USA, 1963-1967)
  • Lewis, Trevor J. (Canada, 1975-1979)
  • Liu, Shaowen (China, 2019-2023)
  • Lomnitz, C. (Chile, 1963-1967)
  • Lubimova, Elena A. (former USSR, Russia, 1963-1983)
  • Lucazeau, Francis (France, 1987-1995)


  • Magnitsky, V.A. (former USSR, Russia, 1963-1967)
  • Majorowicz, Jacek (Canada, 1983-2019)
  • Manzella, Adele (Italy, 2003-2019)
  • Mareschal, Jean-Claude (Canada, 1991-2011)
  • McNitt, James (USA, 1963-1967)
  • Milanovsky, Svet (Russia, 1991-1999)
  • Mongelli, Francesco (Italy, 1975-1987)
  • Morgan, Paul (USA, 1979-1987)
  • Munoz, Miguel (Chile, 1991-1999)


  • Nagaraju, Podugu (India, 2019-2023)
  • Negrete-Aranda, Raquel (Mexico, 2019-2023)


  • Palmason, Gudmundur (Iceland, 1971-1979)
  • Pollack, Henry N. (USA, 1987-1999)
  • Polyak, Boris G. (USA, 1975-1979)
  • Poort, Jeffrey (France, 2019-2023)
  • Popov, Yuri A. (Russia, 1999-2019)
  • Pribnow, Daniel (Germany, 1995-2003)


  • Regenauer-Lieb, Klaus (Australia, 2011-2019)
  • Robinson, S.J. (Australia, 1971-1975)
  • Romanovsky, Vladimir E. (Russia/USA, 1999-2003)
  • Roy, Sukanta (India, 2003-2023)
  • Rybach, Ladislaus (Switzerland, 1975-2003)


  • Saar, Martin (Switzerland, 2015-2019)
  • Safanda, Jan (Czech Republic, 1991-2015)
  • Sass, J.H. (USA, 1987-1991)
  • Schill, Eva (Switzerland, 2011-2019)
  • Sclater, John G. (USA, 1971-1979)
  • Sharbatyan, A. (former USSR, Russia, 1971-1975)
  • Shen, Yxiang-jie (China, 1991-1999)
  • Simmons, Gene (USA, 1963-1975)
  • Smirnov, Ya. B. (former USSR, Russia, 1971-1987)
  • Stegena, Lajos (Hungary, 1963-1987)
  • Stein, Carol A. (USA, 1991-1999)
  • Suetnova, E.I. (former USSR, Russia, 1987-1991)
  • Sugrobov, V.M. (former USSR, Russia, 1971-1975)


  • Tan, (China, 1987-1991)
  • Tanaka, Akiko (Japan, 2019-2023)
  • Taniguchi, Makoto (Japan, 1999-2003)
  • Thamrin, M. (Indonesia, 1983-1991)
  • Tongiorgi, E. (Italy, 1971-1975)


  • Udintsev, G.B. (former USSR, Russia, 1963-1967)
  • Uyeda, Seiya (Japan, 1963-1995)


  • Vakhitova, Guzel (Russia, 2019-2023)
  • Vasseur, Victor (France, 1979-1987)
  • Veliciu, Serban (Romania, 1995-2003)
  • Verdoya, Massimo (Italy, 2003-2023)
  • Villinger, Heinrich (Germany, 1999-2015)
  • Von Herzen, R.P. (USA, 1963-1975)


  • Wang, Kelin (Canada, 1983-1995)
  • Watanabe, T. (Japan, 1975-1979)
  • Wheildon, J. (England, 1975-1979)
  • Williams, Collin (USA, 2011-2019)


  • Yamano, Makoto (Japan, 1987-1999)


  • Zui, Vladimir (Belorussia, 1987-1999)