Efroim Isser aka Izydor Wasserman (1848-1921) – son of Szlama and Dobra nee Wróbel, married to Blima vel Balbina née Goldberik, Płock-based bookseller, printer and social activist. In the years 1872-1887 he ran a bookshop in Rubin Sigelberg’s house on Grodzka Street. In 1876, he founded a printing house where he printed various ephemera. He was a co-founder of the Credit Society of the Town of Płock, one of the initiators of the Society for Providing Medical Assistance to Poor and Sick Jews “Ezras Chojlin” and vice-president of the board of the Jewish Charity Society in Płock.
Izydor Wasserman was also a co-owner of a magnificent tenement house at the corner of Tumska Street and Kanoniczny Square (now 5 Narutowicza Square), where he lived until his death (he died on May 4, 1921).
Nowak-Dąbrowska G., In the footsteps of Płock Jews, Płock 2019
Przedpełski J., Stefański J., Żydzi płoccy w dziejach miasta, Płock 2012