Derick is a founding partner and Executive Chairman of the dhk design group of companies. He, together with Peter Fehrsen, are the design principals active in all the dhk group companies. As group chairman, he is largely involved in the procurement and design of all the work for the group. Apart from his passion for architecture, his keen interest for urban design and interior design and for the recognition of its importance as an essential component in good architecture is the reason why the establishment of dhk urban design and dhk thinkspace was such a natural extension to the architectural practice. He divides his time equally between the Cape Town and Johannesburg offices.