The use of Protozoa as models for ecology, Keynote/Plenary by Invitation (International Asian Congress of Protistology, 2011)
Vice President's address to teh Soc. Protistologists, by Invitation (Soc. Protistologists, 2010)
British Section of Protist Biologists, by Invitation (BSPB, 2008)
Coordinator of special session, by Invitation (SAME 10, 2007)
Examining the role of ciliates in ecosystem models, by Invitation (Danish Institute for Fisheries Research, 2007)
Assesing the role of phytoplanktonic ciliates in food web dynamics; how far have we really come?, Keynote/Plenary by Invitation (University Delhi, India, 2007)
Invited coordinator of a special session: Society of Protozoologists (Lisbon), by Invitation (Society of Protozoologists , 2006)
Molecular variability in microzooplankton, by Invitation (American Society of Limnology and Oceanography, 2005)
Invited coordinator of a special session: Society of Protozoologists 2004 (USA), by Invitation (Society of Protozoologists, 2004)
Ecosystem Dynamics in the Ocean, UK GLOBEC: Royal Society (London ) , by Invitation (Royal Society, 2004)
Third Zooplankton Production Symposium (Gijon, Spain), by Invitation (Third Zooplankton Production Symposium, 2003)
Assessing the variability in Aquatic Microbial Populations: fact or fiction (Austria), by Invitation (Assessing the variability in Aquatic Microbial Populations: fact or fiction, 2003)
Editorships
Journal of Plankton Research (Editorial Board Member, 2007 - present)
Marine Biology Research (Subject Editor (Knowledge And Learning), 2007 - present)