Hans soon found a partner in Ton van Beek. About 2 years after its establishment, Martien Meijer, an old student of Hans, joined the company. Martien has been a member of the board of directors since 1995, and since 2014 carries out this role together with Wouter Lengkeek and Eelco Waardenburg. In the early 1990s, sister company Deltamilieu
, an employment agency for ecologists, was founded. Later, BWZ engineers, which has now become its own independent company, and BESE-products
Zeeland in the Netherlands has remained an important research area for Waardenburg Ecology. 'Het Zijpe' in Bruinisse has been owned by the company since the 1980s. Originally a waiting room and café for the local ferry, it was converted into a base for fieldwork in the delta and surrounding area. Since 1995, Waardenburg Ecology's main offices have been located in an historic mansion in the picturesque town of Culemborg in the centre of the country. A further location was opened in Nijmegen in 2020. As of 2022, we are now comprised of over 140 employees.