English is by far the predominant language used to communicate with foreigners. German, French and Spanish follow on a large distance. You will be able to work and live in the Netherlands by just using English, as almost all Dutch have a good level of English.
This topic is relevant for all internationals in the Netherlands, not only for international academics. To give you the most complete and up-to-date practical information about Dutch language courses, FactCards refers you to ACCESS Living. FactCards remains focused on academic and research careers in the Netherlands.
Continue to ACCESS Living.