• Editor in Chief designate, Antonie van Leeuwenhoek International Journal of Microbiology
• Senior Editor, Journal of Industrial Microbiology and Biotechnology
• Editor, FEMS Microbiology Letters
• Editorial Boards, Applied and Environmental Microbiology, BioMetals, International Biodeterioration and Biodegradation

Research interest: The molecular genetics and biochemistry of how bacterial cells cope with toxic overload of inorganic cations and anions. The genes for most of the resistance systems that he studies reside on bacterial plasmids. He has studied those for mercury, cadmium, arsenic, copper, chromate, cobalt, nickel, zinc, and silver resistances.