Rabbi David Zvi Schneebalg was the head of the Beis Din (Rabbinical Court) and Yeshiva of Vishnitz. The Schneebalg family lived through the Russian invasion of Poland in 1939 and the subsequent German occupation when they were able to escape. Rabbi David Zvi came to Manchester and became the rabbi of the Machzikei Hadath in 1947. He eventually moved to Bnei Brak where he died in 1968. His son, Rabbi Menachem Mendel Schneebalg, who lived to be 100 years old, succeeded him in Manchester.
His younger brother, Rabbi Shraga Feivish Schneebalg married Freidel, the only daughter of Rabbi Moses Munt. Rabbi Munt came to London in 1952 and established a Beth Hamidrash Damesek Eliezer (named after his father, I think) in North London. Rabbi Shraga Feivish was the spiritual head of the Vishnitz minyan in Stamford Hill.
Rabbi Pinchas Halevy Horowitz, the author of the original book, which is about the laws of Pesach (Passover), was the head of the Beis Din of Grosswardein in Romania. The two Schneebalg brothers, Rabbi Menachem Mendel and Rabbi Shraga Feivish published this edition in London in 1960, with additional material and corrections.
My copy has an accompanying letter from Rabbi Shraga Feivish Schneebalg tipped in. There is also an interesting list of donors towards printing costs at the end.
Jewish Miscellanies 