Trudy Wassenaar isa member of the Editorial board of:

She is a referee for a number of journals, including:

She has acted as a referee for chapters in the following books: Environmental Microbiology and Ecology (Blackwell); Campylobacter, 2nd Edition (ASM Press).

External examiner of Ph.D. theses from: RMIT University, Sydney, Australia; Utrecht University, The Netherlands; University of Cape Town, South Africa, Complutensa University of Madrid  (UCM), Madrid, Spain.