On his arrival in Japan, Rossier presumably introduced himself as a photographer despatched to Japan by "Negretti and Zambra", perhaps thereby inspiring a misconception, for while he remained in the country he was often referred to as an "English" photographer. In Nagasaki, Rossier was assisted in his work by Maeda Genzō, who had been instructed to accompany the "Englishman" and to further learn photography. With Maeda and other students escorting him around the city, Rossier took photographs of priests, beggars, the audience of a sumo match, the foreign settlement, and the group portrait of Alexander von Siebold and samurai. Rossier believed that Pompe van Meerdervoort's failures in photography were due to a lack of the necessary chemicals and so he provided Maeda with a letter of recommendation to procure photographic apparatus and chemicals from a source in Shanghai. Both Maeda and Furukawa bought lenses, chemicals and albumen paper through Rossier.