TGG Hafen Senn Stieger The designers Dominik Hafen, Bernhard Senn and Roland Stieger founded the TGG Hafen Senn Stieger agency for visual communication in the Swiss town of St.Gallen in 1993. They had met while training together to become typographical designers – students of the book designer Jost Hochuli – at the School of Design in St.Gallen. Alongside the work in their own design agency, which now employs around a dozen designers, they are also involved in teaching. In the area of visual communication, the agency focuses on book and editorial design, signage, exhibition organisation, corporate, web and type design.