Many people are/have been involved in CLEF eHealth (in alphabetical order): 

Samir Abdelrahman, University of Utah, USA
Leif Azzopardi, University of Strathclyde, UK
Wendy W Chapman, University of Utah, USA
Riitta Danielsson-Ojala, University of Turku, Finland
Noemie Elhadad, Columbia University, USA
Gabriela Ferraro, NICTA and The Australian National University, Australia
Lorraine Goeuriot, Université Grenoble Alpes, France
Cyril Grouin, CNRS-LIMSI, Orsay, France
Thierry Hamon, CNRS-LIMSI and Université Paris-Nord, Orsay, France
Allan Hanbury, Vienna University of Technology, Austria
Leif Hanlen, NICTA, The Australian National University, University of Canberra, Canberra, ACT, Australia
Preben Hansen, SICS and Stockholm University, Sweden
Harry S Hochheiser, University of Pittsburgh, USA
Gareth Jones, Dublin City University, Ireland
Evangelos Kanoulas, University of Amsterdam, Netherlands
Jussi Karlgren, KTH and Gavagai, Sweden
Lotta Kauhanen, University of Turku, Finland
Daniel Keim, University of Konstanz, Germany
Liadh Kelly, Maynooth University, Ireland
Martin Krallinger, Barcelona Supercomputing Center, Spain
Maria Kvist, Karolinska Institutet and DSV Stockholm University, Sweden
Mariana Lara-Neves, German Federal Institute for Risk Assessment, Germany
Benjamin Lecouteux, Université Grenoble Alpes, France
Gondy Leroy, University of Arizona, USA
Johannes Leveling, Dublin City University, Ireland
Dan Li, University of Amsterdam, The Netherlands
Wei Li, Dublin City University, Ireland
Heljä Lundgrén-Laine, University of Turku, Finland
Mihai Lupu, Vienna University of Technology, Austria
David Martinez, NICTA and The University of Melbourne, Australia
Antonio Miranda-Escalada, Barcelona Supercomputing Center, Spain
Danielle L Mowery, University of Pittsburgh, USA
Henning Mueller, HES-SO, Switzerland
Laura Maria Murtola, University of Turku, Finland
Aurélie Névéol, Centre National de la Recherche Scientifique (CNRS-LIMSI), Orsay, France
Jaume Nualart, NICTA and University of Canberra, Australia
Joao Palotti, Vienna University of Technology, Austria
Pavel Pecina, Charles University in Prague, Czech Republic
Sameer Pradhan, Harvard Medical School and Boston Children’s Hospital, USA
Sanna Salantera, University of Turku, Finland
Guergana Savova, Harvard Medical School and Boston Children’s Hospital, USA
Tobias Schreck, University of Konstanz, Germany
Brett R South, University of Utah, USA
Rene Spijker, Cochrane Netherlands, Julius center for Health Sciences and primary care, UMC Utrecht, Utrecht; Amsterdam UMC, Univ. Of Amsterdam,medical library, Amsterdam public health, Amsterdam 
Hanna Suominen, NICTA, The Australian National University, University of Canberra, University of Turku (Turku, Finland), Canberra, ACT, Australia 
Xavier Tannier, CNRS-LIMSI and Université Paris-Sud, Orsay, France
Ozlem Uzuner, State University of New York, New York, USA
Sumithra Velupillai, DSV Stockholm University, Sweden
Qing Treitler Zeng, University of Utah, SLC VA, Utah, USA
Joe Zhou, NICTA, Canberra, ACT, Australia
Guido Zuccon, Queensland University of Technology, Australia
Pierre Zweigenbaum, CNRS-LIMSI, Orsay, France