George B. Eisler, a publisher and a researcher in Hebrew studies who lived in New York in the years after World War II, died of cancer in Hamburg, West Germany, on Nov. 18. He was 91.Mr. Eisler was a founder of Focal Press, a publisher of books in London and New York on photography. He also founded Global Press, which published works in New York on cartography. He was a native of Hamburg and worked for Heinrich Eisler Werbung, the trade-journal publishing house founded in 1883 by his father. He then started a center for Hebrew studies in Britain and returned to Hamburg in the 1950's.Surviving are 3 daughters, Fredericka Arnholz of Boston, Ernestine Eisler of Cambridge and Gerda Chambers of London; 3 sons, Colin Eisler of New York, H. Michael Eisler of Philadelphia and Sean Graham of London; 13 grandchildren and 7 great-grandchildren.