Thomas Gust lives and works in Berlin, where he co-directs Buchkunst Berlin with designer and photographer Ana Druga. Together, they lead the publishing house, gallery, and agency, producing internationally recognized photo books presented at fairs including the Frankfurt Book Fair, Polycopies Paris, Arles Photo Festival, and the Hong Kong Photo Book Festival. Their titles have received medals from the German Photo Book Award and nominations for the Paris Photo–Aperture Book Awards.

Since 2021, Thomas and Ana have also directed Galerie Buchkunst Berlin, which showcases both classic and contemporary photography through rotating exhibitions and international fairs such as Scope Miami, Photo Basel, and Unseen Amsterdam. Artists featured include Thomas Hoepker, Roger Ballen, Michael Wolf, Bára Prášilová, Yasuhiro Ogawa, and René Groebli.

Thomas lectures on photo history, photo book history, and photo book design at the Ostkreuz School of Photography and the University of Arts and Applied Sciences Dortmund. He has also taught at institutions such as Berlin University of the Arts, ARU John Ruskin University in Cambridge, the International Center of Photography in New York, Hong Kong University, and Deichtorhallen Hamburg. He is a member of the German Photographic Society (DGPh) and the German Academy of Photography (DFA).