At the end of 2018, WSL's 508 employment contracts amounted to 442,5 full-time equivalents (FTEs). Scientists accounted for roughly 57 % of all staff (FTEs). WSL's team of scientists included 56 PhD students and 46 post-doctoral researchers. Its staff also included 14 apprentices, being trained in nine professions.
The proportion of women (excluding apprentices) was 36 %. Foreign staff accounted for around 30% and came from 36 different countries. German was the mother tongue of most employees (77%).
WSL launched a Visiting Fellows programme to increase research collaboration with foreign scientists. The aim of this programme is to enable leading international researchers at an advanced stage of their career to spend 3-12 months conducting research at WSL. Fellowships are awarded annually to international applicants. Four Visiting Fellows from various research establishments around the world worked at WSL in 2018.