At the end of 2019, WSL's 533 employment contracts amounted to 468,3 full-time equivalents (FTEs). Scientists accounted for roughly 58 % of all staff (FTEs). The scientific staff includes 61 doctoral students and 58 post-doctoral researchers. Its staff also included 12 apprentices, being trained in six professions.
The proportion of women (excluding apprentices) was approximately 38 %. Foreign staff accounted for nearly 33 %. WSL staff came from 36 different countries. German was the mother tongue of most employees (80%).
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. Thirteen Visiting Fellows from various research establishments around the world worked at WSL in 2019.