Prof. Marc J Assael has also participated in / or as:
1991 : Organizing Committe for ΝΑΤΟ Advanced Research Workshop "The Status & Future Developments in the Study of Transport Properties", Porto Carras, Chalkidiki, Greece, May 29-31.
1997 : Organizing Committee of 1st Panhellenic Scientific Chemical Engineering Conference, Patras, Greece, May.
1999 : Chairman of the Organizing Committee of 2nd Panhellenic Scientific Chemical Engineering Conference, Thessaloniki, Greece, May.
1999 : Scientific Committee of 1st International IUPAC Workshop on "Thermochemical, Thermo¬dynamic and Transport Properties of Halogenated Hydrocarbons and Mixtures", Piza, Italy, December.
2001 : Organizing Committee of 3rd Panhellenic Scientific Chemical Engineering Conference, Patra, Greece, May.
2001 : Scientific Committee of 2nd International IUPAC Workshop on "Thermochemical, Thermo¬dynamic and Transport Properties of Halogenated Hydrocarbons and Mixtures", Paris, France, April.
2001 : Scientific Committee of 6th Asian Thermophysical Properties Conference, Guahati, Assam, India, October.
2002 : Organizing Committee of 16th European Thermophysical Properties Conference, London, UK, September.
2003 : Organizing Commttee of 4th Panhellenic Scientific Chemical Engineering Conference, Patra, Greece, May
2005 : Chairman of the Organizing Committee of 5th Panhellenic Scientific Chemical Engineering Conference, Thessaloniki, Greece, May.
2005 : Chairman of the Organizing Committee of 2005 Ιnternational Association for the Properties of Water & Steam Meeting, Santorini, Greece, July.
2005 : Organizing Committee of 17th European Thermophysical Properties Conference, Bratislava, Slovakia, September.
2007 : Organizing Committee of 6th Panhellenic Scientific Chemical Engineering Conference, Athens, Greece, May.
2009 : Organizing Committee of 7th Panhellenic Scientific Chemical Engineering Conference, Patra, Greece, June.
2011 : Chairman of the Organizing Committee of 8th 1st Panhellenic Scientific Chemical Engineering Conference, Thessaloniki, Greece, May.
2011 : Chairman of th Organizing Committee of 19th European Conference on Thermo-physical Properties, Thessaloniki, Greece, August 28th – September 3rd.
2013 : Scientific Committee of 10th Asian Thermophysical Properties Conference, Jeju, Korea, September 28 – October 3rd.
2016 : Scientific Committee of 11th Asian Thermophysical Properties Conference, Yokohama, Japan, October 2 – 6.
2017 : International Organizing Committee, of 21st European Conference on Thermophysical Properties, Graz, Austria, September 3-8.

and organized the following IATP Scientific Meetings:
1990: STP Scientific Meeting, Thessaloniki, Greece
1991: STP Scientific Meeting, Hambourg, Germany
1992: STP Scientific Meeting, Rostock, Germany
1993: STP Scientific Meeting, Lisbon, Portugal
1994: STP Scientific Meeting, Boulder, Colorado, USA
1995: STP Scientific Meeting, Guildford, UK
1996: STP Scientific Meeting, Geirangen, Norway
1997: STP Scientific Meeting, Boulder, Colorado, USA
1998: STP Scientific Meeting, Amsterdam, The Netherlands
1999: STP Scientific Meeting, Εrlangen, Germany
2000: STP Scientific Meeting , Boulder, Colorado, USA
2001: 1st IATP Scientific Meeting, Chalkidiki, Greece
                (Renamed International Association for Transport Properties)
2002: 2nd IATP Scientific Meeting, Imperial College, UK
2003: 3rd IATP Scientific Meeting, Boulder, Colorado, USA
2004: 4th IATP Scientific Meeting, Pau, France
2005: 5th IATP Scientific Meeting, Bratislava, Slovakia
2006: 6th IATP Scientific Meeting, Boulder, Colorado, USA
2007: 7th IATP Scientific Meeting, Instanbul, Turkey
2008: 8th IATP Scientific Meeting, Pau, France
2009: 9th IATP Scientific Meeting, Boulder, Colorado, USA
2010: 10th IATP Scientific Meeting, Santiago, Spain
2011: 11th IATP Scientific Meeting, Thessaloniki, Greece
2012: 12th IATP Scientific Meeting, Boulder, Colorado, USA
2013: 13th IATP Scientific Meeting, Bremen, Germany
2014: 14th IATP Scientific Meeting, Porto, Portugal
2015: 15th IATP Scientific Meeting, Boulder, Colorado, USA
2016: 16th IATP Scientific Meeting, London, U.K.
2017: 17th IATP Scientific Meeting, Graz, Austria
2018: 18th IATP Scientific Meeting, Boulder, Colorado, USA