Arthur Grandjean, missionary of the Church of French Switzerland (La Suisse Romande), arrived on the coastal plane of Mozambique with H.A. Junod* in about 1888 to support the missionary work of Paul Berthoud*, who then resided at Rikatla. They opened the stations Lorenço Marques in 1889 and Antioka in 1890. An article by Grandjean (in French) on the "invasion" of the Zulus into south-east Africa appeared in Le Globe: Journal Géographique (Genève) in 1898. He published two further articles (also in French) on the geography and cartography of the territory, both in the Bulletin de la Societé Neugatelaise de Géographie (Geneva). One dealt with the cartography of the region around present Maputo. The other, published in 1900, dealt with the valley of the Komati River and its connection with the Limpopo in Mozambique.
Grandjean wrote an introduction and notes for the publication in 1900 of the letters written by Paul Berthoud from Lesotho and the Transvaal between 1873 and 1879. He also participated in the publication in 1904 of the letters written by Paul's second wife, Madame Ruth Berthoud, from the Transvaal and Mozambique. His later publications dealt mainly with La Suisse Romande and its work among the Tsonga (1917, 1919, 1921).
