[2] He made ethnological and archaeological explorations in India and the Himalayas, He travelled to Morocco, and was a Secretary of the Society of Anthropology of Paris.

Roussellet wrote: "On 20 June 1863[4] I embarked at Marseilles on board the "Vectis", an English steamer bound for the East", he stopped off in Malta, Cairo and Aden, before boarding the "Malta" taking the Suez Canal to Bombay and India,[5] "I intended to mainly visit all the northern region, which includes, besides the English Presidency of Bengal, the feudal states of Rajasthan, the Bundelcund, the Goundwana, The Punjab and the Kingdom of Nepal".

He was to write, "It was on seeing these generally unknown masterpieces at Dubbhoee that I regretted I had not the power of reproducing them by photography, and felt that it would be impossible to continue my explorations profitably without the assistance of that art.

On his return to France he published excerpts from his Indian diary along with woodcut illustrations taken mostly from his sketches and photographs in a French weekly journal Le Tour du Monde.

My old bearer Devi, the trusty servant who had followed me for two years through so many good and evil fortunes, was there also, melted in tears, and embracing my knees.

On return to France, in 1868, he began to work with Goupil & Cie on a publishing project entitled "travel in India ML Rousselet", composed of one hundred sixty photographic plates.

[11] In 1873 he became editor-in-chief of Hachette's Le Journal de la jeunesse, a weekly magazine aimed at educating and entertaining youths aged between 10 and 15; the advent of World War I put a stop to it.

Legion of Honour (Chevalier) Palmes Académiques + " The Son of the Constable of France or the Adventures of Jean de Bourbon" (1882)