- Prof Sami K Solanki (Göttingen), 16 Januar 2017, Cologne Geosciences Colloquium
- Prof Andreas Bott (Bonn), keynote lecture, 20 Januar 2017, GSGS Research Conference
- Prof Andreas Pack (Jena), keynote lecture, 20 Januar 2017, GSGS Research Conference
- Dr Koko Warner (United Nations Framework Convention on Climate Change), keynote lecture, 20 Januar 2017, GSGS Research Conference
- Prof Hans Joosten (Greifswald), 25 Januar 2017, Cologne Geosciences Colloquium
- Prof Falko Langenhorst (Friedrich-Schiller-University Jena), 24 April 2017, Cologne Geosciences Colloquium
- Prof Christian Schulz (University of Luxembourg), 8 Mai 2017, Cologne Geosciences Colloquium
- Dr Jonathan Nichols (University of Leicester, UK), 22 Mai 2017, Cologne Geosciences Colloquium
- Prof Corinna Hoose (Karlsruhe Institute of Technology (KIT)), 3 Juli 2017, Cologne Geosciences Colloquium
- Prof Alexander Densmore (Durham University, UK), 17 Juli 2017, Cologne Geosciences Colloquium
- Prof John Sweeny (National University of Ireland, Maynooth), 9 Oktober 2017, Cologne Geosciences Colloquium
- Dr Hans von Storch (University of Hamburg), 6 November 2017, Cologne Geosciences Colloquium
- Prof Rosalind Rickaby (University of Oxford, UK), 20 November 2017, Cologne Geosciences Colloquium
- Dr Casper Tai Christiansen (Scientific leader, Arctic Station, Disko Island, Greenland), 18 Dezember 2017, Cologne Geosciences Colloquium

- Dr Stefan Ouma (Goethe UNiversität Frankfurt), 11 Januar 2016, Cologne Geosciences Colloquium
- Prof Johannes Quaas (Universität Leipzig), 25 Januar 2016, Cologne Geosciences Colloquium
- Dr Philippa Ascough (University of Glasgow), 29 Januar 2016, GSGS Research Conference
- Dr James T Murphy (Clark University, Worcester), 29 Januar 2016, GSGS Research Conference
- Prof Klaus Spitzer (TU Freiburg), 29 Januar 2016, GSGS Research Conference
- Prof Katja Matthes (GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel & Christian-Albrechts-Universität zu Kiel), 25 April 2016, Cologne Geosciences Colloquium
- Prof Gerhard Wörner (University of Göttingen), 6 Juni 2016, Cologne Geosciences Colloquium
- Prof James B Gill (University of California), 20 Juni 2016, Cologne Geosciences Colloquium
- Dr Chris Arridge (Lancaster University), 18 Juli 2016, Cologne Geosciences Colloquium
- Prof Giles Harrison (University of Reading), 24 Oktober 2016, Cologne Geosciences Colloquium
- Prof Patrick Cordier(University of Lille), 7 November 2016, Cologne Geosciences Colloquium
- Prof Bjorn Stevens (University of Hamburg), 21 November 2016, Cologne Geosciences Colloquium
- Dr Tabea Bork-Hüffer (Singapore), 5 Dezember 2016, Cologne Geosciences Colloquium

- Prof Berndt Feuerbacher (Ruhr-University Bochum), 19 Januar 2015, Cologne Geosciences Colloquium
- Prof Dr Artie Hatzes (Friedrich-Schiller-Universität Jena), 23 Januar 2015, GSGS Research Conference
- Prof Dr Gert Verstraeten (KU Leuven), 23 Januar 2015, GSGS Research Conference
- Dr Gerald M Ganssen (VU Amsterdam), 23 Januar 2015, GSGS Research Conference
- Dr Dave Turner (NSSL Oklahoma), 6-15 Februar 2015, AG Crewell
- Prof Kim Philip Schumacher (Universität Vechta), 23 April 2015, Cologne Geosciences Colloquium
- Dr Eileen Päschke (TU Berlin), 20-22 April 2015, AG Crewell
- Prof Dagmar Haase (Humboldt-Universität zu Berlin), 27 April 2015, Cologne Geosciences Colloquium
- Prof Wilfried Jokat (Alfred Wegener Institute, Bremerhaven), 8 Juni 2015, Cologne Geosciences Colloquium
- Prof Friedhelm von Blanckenburg (Deutsches GeoForschungsZentrum GFZ Potsdam), 22 Juni 2015, Cologne Geosciences Colloquium
- Dr Jennifer Jefferson (Colorado School of Mines), 4 Mai- 19 Juni 2015, AG Crewell
- Prof Mustapha Meghraoui (Université de Strasbourg), 6 Juli 2015, Cologne Geosciences Colloquium
- Umar Saeed (UPC Barcelona), ITaRS-fellow, 17 August - 2 September 2015, AG Crewell
- Prof Nicole van Lipzig (Leuven), 3-31 August 2015, AG Crewell
- Prof Martin Visbeck (Christian-Albrechts Universität zu Kiel), 19 Oktober 2015, Cologne Geosciences Colloquium
- Prof Bill Pritchard (University of Sydney), 2 November 2015, Cologne Geosciences Colloquium
- Antti Manninen (Helsinki), 9-13 November 2015, AG Crewell
- Prof Frank Schilling (Technical University Karlsruhe), 16 November 2015, Cologne Geosciences Colloquium
- Dr Jussi Leinonen (JPL, Pasadena), 26-30 October 2015, AG Crewell
- Prof Susan Waldron (University of Glasgow), 30 November 2015, Cologne Geosciences Colloquium
- Prof Hans-Joachim Kümpel (President of the Federal Institute for Geosciences and Natural Resources (BGR)), 14 Dezember 2015, Cologne Geosciences Colloquium

- Dr Dave Turner (NSSL Oklahoma), 13-18 Februar 2014, AG Crewell
- Umar Saeed (UPC Barcelona), ITaRS-fellow, 10-14 März 2014, AG Crewell
- Sophia Schäfer (University of Reading), ITaRS-fellow, 22-26 April 2014 & 19 September-03 Oktober, 2014, AG Crewell
- Xiaoli Zhou (McGill), 15 May-15 Juni 2014, AG Crewell
- Dr Pavlos Kollias (McGill), 01-03 Juli 2014, AG Crewell
- Prof Thomas Glade (University of Vienna), 4 Juli 2014, GSGS Research Conference
- Prof Nicole van Lipzig (KU Leuven), 4 Juli 2014, GSGS Research Conference
- Prof David Hodell (University of Cambridge), 4 Juli 2014, GSGS Research Conference
- Dr Samuel Lewis (NCAR Terrestrial Science Section), 18-21 Juli 2014, AG Crewell
- Marvin Forde (Carribean Institute for Meteorology and Hydrology), 02-05 September 2014, AG Crewell
- Prof Robin Boyle (Wayne-State-University), 27 Oktober 2014, Cologne Geosciences Colloquium
- Prof Rainer Grün (The Australian National University), 10 November 2014, Cologne Geosciences Colloquium
- Dr Stephan de Roode (Delft University of Technology), 24 November 2014, Cologne Geosciences Colloquium
- Dr Giandomenico Pace (ENEA), 03 November-03 Dezember 2014, AG Crewell
- Dr Arco Lucieer (University of Tasmania), 8 Dezember 2014, Cologne Geosciences Colloquium

- Lev Labzovsky (INOE Bucharest), ITaRS-fellow, 17 April – 04 Mai 2013, AG Crewell
- Umar Saeed (UPC Barcelona), ITaRS-fellow, 17-27 April 2013 & 27 Juli – 30 August 2013, AG Crewell
- Prof Pavlos Kollias (McGill University Montreal), Juli – Dezember 2013, AG Crewell
- Dr Christine Chiu (University of Reading), 18-19 Juli 2013, AG Crewell
- Dr Katja Friederich (CZ Boulder), 8-11 Oktober 2013, AG Crewell
- Sophia Schäfer (University of Reading), ITaRS-fellow, 12-27 Oktober 2013, AG Crewell
- Dr Dave Turner (NSSL Oklahoma), 7-24 Mai 2013, AG Crewell

- Bianca Adler (KIT), 15-16. März 2012, AG Crewell
- Ping Wang (KNMI), 27 März 2012, AG Crewell
- Jimmy Voyles (DOE) and Shaocheng Xie (LLNL), JOYCE - ARM cooperation, Juni 2012, AG Crewell
- Dave Turner (NSSL Oklahoma), 6-20 August 2012, AG Crewell
- Pavlos Kollias (Mc Gill University, Montreal), 10 – 14 Oktober 2012, AG Crewell
- Thomas Ackerman (UWashington), 29. Oktober 2012, AG Crewell

- Veronique Meunier, 24. Februar – Ende März, AG Crewell
- Peter Bauer, ECMWF, Kolloquium, 18. April, AG Crewell
- Stefan Klink, EUCOS, Kolloquium, 16. Mai, AG Crewell
- Manfred Wendisch, ULeipzig, Kolloquium, 20. Juni, AG Crewell
- Dave Turner, NOAA, Juli/August, AG Crewell
- Florian Kerber, ESO, 9. August, AG Crewell
- Dong Wu, NASA, 28. September, AG Crewell
- Thomas Leisner, KIT, Physik-Kolloquium, 1. November, AG Crewell
- Anthony Illingworth, Reading, Kolloquium, 21. November, AG Crewell

- Christian Mätzler, IAP Bern, Kolloquium, 1. Februar 2010, AG Crewell
- Olaf Maier, MeteoSwiss, STSM EG-CLIMET, 8.-12. Februar 2010, AG Crewell
- Axel Seifert & Martin Köhler, DWD, Arbeitsbesprechung, 18. Juni 2010, AG Crewell
- Robert Pincus, University of Colorado/NOAA, Vortrag, 27. Juli 2010, AG Crewell
- Antonio Martellucci, ESA/ESTEC, ATPROP Besprechung, 29. Juli 2010, AG Crewell