HHF architects was founded in 2003 by Tilo Herlach, Simon Hartmann and Simon Frommenwiler. Since then HHF have realized projects in Switzerland, Germany, China, Mexico, France and the USA. The scope of work ranges broadly and includes: large scale construction, e.g., fashion center Labels Berlin 2; interior design, e.g., the Confiserie Bachmann in Basel; master planning, e.g., the public space and mobility strategy for the Praille Acacias Vernets, Geneva; public structures, e.g., Ruta del Peregrino Lookout Point of a pilgrimage route in Mexico; or the Baby Dragon pavilion in the Jinhua Architecture Park, China. 

From the beginning HHF has aimed for collaborations with other architects, artists and specialists in order to widen the view on a project and enrich the quality of a specific proposal.

In addition to building, teaching is an important activity of the office. Since 2009 Simon Hartmann has been Professor at the HTA in Fribourg, Switzerland. Previously he served as a teaching assistant and head of teaching at the ETH Studio Basel, with Professors Jacques Herzog, Pierre de Meuron, Roger Diener and Marcel Meili. Simon Frommenwiler was a teaching assistant with Professor Harry Gugger at the ETH in Lausanne and a guest professor at the HTA in Fribourg. HHF architects also guest lectured at the UIA in Mexico City, at MIT in Boston and the University of Innsbruck and the firm's architects have participated as jury members at numerous universities.