Neufeld settled in Warsaw in 1861, where worked as an editor of Samuel Orgelbrand's Encyklopedia powszechna (until 1868) and as a teacher in Jewish government schools.[3][4] There he published a work on the Great Sanhedrin of 1806 under the title Wielki Sanhedryn Paryski w Roku 1806. On 5 July 1861, Neufeld commenced the publication in Polish of a Jewish weekly newspaper entitled Jutrzenka [pl] (Hebrew: Ayelet ha-Shaḥar), which sought to promote among Jews the Polish language and way of life.[5] The periodical was closed during the January Uprising on 23 October 1863 and he was exiled to Siberia.[6]
Upon returning to Warsaw two years later, the tsarist authorities forbade Neufeld from teaching or printing in the press. He instead dedicated himself to promoting progressive Judaism and assimilation.[3][7] He published a Polish translation of the books of Genesis and Exodus, with a commentary (1863); a pamphlet on the establishment of a Jewish consistory in Poland entitled Urzadzenie Konsystorza Zydowskiego w Polsce; a gnomology of the fathers of the Synagogue; and Polish translations of the siddur and the Haggadah (1865).[8]
Towards the end of his life Neufeld settled in Piotrków, where he served as the honorary director of a Jewish hospital.[4] He died in Warsaw in October 1874.