CHEAQS was written by Wilko Verweij. He studied inorganic chemistry at Groningen University where he did a master thesis on speciation of arsenic (1986). From 1986 until 1991, he did his Ph.D. research at the Limnological Institute (subject: speciation of copper in lakes with high content of organic matter). For this thesis, Wilko developed his first speciation program called GECHEQ. Later he continued developing chemical equilibrium models, with special attention for the user friendliness and chemical intuition.
From 1991 until 2017, he worked at the National Institute for Public Health and the Environment, since 2018 he work at Deltares. CHEAQS is not a product of these institutes.
Main focus of his current work is (both surface and ground-) water quality in a national and international context, with special attention for the implementation of the European Water Framework Directive. Wilko worked in Bulgaria, Croatia, (North-)Macedonia, Romania, Serbia and Turkey to assist those countries in implementing the Water Framework Directive. He also worked in Tunisia.
You can find his LinkedIN-profile here.