De Groot has also designed various custom fonts for particular clients: Corpid (previously AgroSans) for the Dutch Ministry of Agriculture; SunSans for Sun Microsystems; SpiegelSans and Taz for, respectively, the German magazines Der Spiegel and die tageszeitung; and FolhaSerif for the Brazilian newspaper Folha. Some of these have since become publicly available.
De Groot teaches at the Design Faculty of the University of Applied Sciences, Potsdam, Germany.
^"The Typographic Times | [Interview with Lucas de Groot]". Planet Typography. September 2008. Retrieved 2015-10-09. My full name is Lucas Adrianus Wilhelmus de Groot, my calling name is Luc (officially printed on my birth announcement!). When I was young, some people called me Luc, others Lucas. I wasn’t aware of the difference until I had to design my business card in school, then I came with this solution: Luc(as).