Adriaan Vlacq was a bookseller and publisher. In 1632 he settled in London and opened a bookshop. Tension between King Charles I and the House of Commons steadily increased during 1641 and after his unsuccessful attempt to arrest five members of Parliament on 4 January 1642 Charles left London on 10 January and King and Parliament prepared for war. Vlacq decided that London was not a good place to sell books with the approaching unrest so he left for Paris in 1642. A dedication in a book he published 10 years later suggests that he sympathised with the Royalist side in the Civil War.
In Paris Vlacq again set up a book business. He remained there for six years before returning to The Hague where he again sold and published books.
Vlacq published a table of Briggs logarithms from 1 to 100,000 to 10 decimal places in Arithmetica logarithmica in 1628. Briggs' own tables were only 1 to 20,000 and 90,000 to 100,000 so Vlacq added 70,000 values.
Vlacq also constructed log trigonometric tables which he published in 1633 during his time in London.
Vlacq also published many mathematical works by other authors including, perhaps surprisingly, by Briggs himself.