Between 1900 and 1904 he travelled to Paris and the United States, by request of ʻAbdu'l-Bahá, where his talks and writings enabled the fledgling Baháʼí communities to gain confidence and a clear understanding of the religion. During his travels, he was accompanied by Laura Clifford Barney, an American Baháʼí. In Paris, his talks were translated by Anton Haddad, and over thirty people became Baháʼís. Then in the autumn of 1901 travelled to the United States, and specifically to Chicago, where the largest Baháʼí community was, and gave a large number of talks. Then in December 1901, Abu'l-Faḍl travelled to Washington D.C. and gave talks to both Baháʼís and the general population. During this time, he also continuously worked on an introductory book on the Baháʼí Faith.