Jonathan Jones is a senior scientist at the Met Office, working in the Observations R&D Department since 2002. Jonathan's research interests relate to the derivation of tropospheric and ionospheric observations from GNSS signals, receiving his PhD in the field from the University of Nottingham in 2010. Jonathan has been involved in many European collaborative GNSS projects, recent roles include: Chair of COST Action ES1206 GNSS4SWEC (2013-2017), Chair of the EIG EUMETNET E-GVAP Processing and Standards Working Group and co-Chair of the GCOS Reference Upper Air Network (GRUAN) GNSS Precipitable Water Vapour Task Team. He is a member of many scientific working groups such as the IGS Tropospheric Working Group, IAG Working Group 4.3.3, EPOS WG4 and GAIA-CLIM WP2, is a Fellow of the Royal Meteorological Society and an editor of the ACP/AMT/ANGEO inter-journal Special Issue on Advanced GNSS Tropospheric Products for Severe Weather Events and Climate.

Guergana Guerova is an associate professor at the Department of Meteorology and Geophysics of Sofia University. She received her Master's degree in meteorology and PhD in Applied Physics from the University of Bern. She is a former Marie Curie IRG Fellow (2011-2014) and vice chair of COST Action ES1206 GNSS4SWEC (2013-2017). Her research interest include monitoring short and long-term variation of GNSS derived water vapour, especially for studying fog, intense precipitation, hail storms and heat waves. She teaches courses at both the undergraduate (Introduction to Meteorology part 1, Synoptic Analysis) and graduate (Satellite Imagery Interpretation) level.

Jan Dousa is a senior researcher at the Research Institute of Geodesy, Topography and Cartography (RIGTC) - Geodetic Observatory Pecný (GOP), Czech Republic, where he is leading GNSS group. He obtained a PhD degree at the Department of Advanced Geodesy, Czech Technical University in Prague in 1999. He participated in several international projects dealing with ground-based GNSS tropospheric research, such as COST 716, TOUGH, E-GVAP, Trop4LAS, DARTMA, COST 1206, IGS Tropo WG, and he led others with a national support. His interests are in advanced methods of precise GNSS processing, with a particular focus on reference frames (EUREF), precise GNSS orbit determination (IGS), troposphere monitoring (E-GVAP, GNSS4SWEC), GNSS in solid earth sciences (EPOS) and software development (G-Nut). Dr Dousa was chair of Working Group 1 in the GNSS4SWEC COST project, chair or vice-chair of several IAG working groups, member of the EUREF Governing Board and ESA GNSS Scientific Advisory Board, and associate member of the International GNSS Service.

Galina Dick is a senior scientist at the German Research Centre for Geosciences GFZ in Potsdam, where she has been responsible for the ground-based GNSS atmospheric sounding since 2000 and became a group leadership of "GNSS Meteorology" in 2017. She has been involved in many European GNSS meteorology projects since 1999, like the COST Action 716 "Exploitation of ground-based GPS for climate and numerical weather prediction applications" and the European Commission's TOUGH project "Targeting Optimal Use of GPS Humidity Measurements in Meteorology". She is head of the GFZ GNSS Analysis Centre for the EUMETNET EIG GNSS Water Vapour Programme (E-GVAP). Within GRUAN - The Global Climate Observing System (GCOS) Reference Upper-Air Network - she is responsible for GNSS Data Processing Centre. She is an associate member of the International GNSS Service (IGS), a member of the IGS troposphere working group, as well as a member of several expert teams and working groups dealing with GNSS-derived precipitable water vapour. Within COST Action GNSS4SWEC she was a co-chair of the Working Group 1: "Advanced Processing Techniques".