Frederik (Frits) Muller has been an antiquarian bookdealer since 1993. He specialises in the early voyages of discovery and later travel accounts. 

His collection consists of original, antique maps, topographical prints and books on geography and voyages as they were made by the Europeans to explore Africa, Asia, the Americas, the North East and North West passage and the Southland. His involvement in these issues comes through the lines of the genes (Frederik Muller was an important antiquarian bookdealer in the mid XIX century) and by personal experience as a doctor, working in developing countries.