David de Sola Pool (דוד די סולה פול;‎ 1885–1970) was the leading 20th-century Sephardic rabbi in the United States. A scholar, author, and civic leader, he was a world leader of Judaism. Born in London, England, de Sola Pool was descended from an old and renowned family of rabbis and scholars, de Sola, which traces its origins to medieval Spain. His great grandparents were Rabbi (R.) David Aaron de Sola and Rebecca Meldola, his great-great grandfather was Haham Raphael Meldola, a prominent English Rabbi. He was also related to R. Abraham de Sola, R. Henry Pereira Mendes and Dr. Frederick de Sola Mendes. He studied at the University of London. He held a doctorate in ancient languages, summa cum laude, from the University of Heidelberg. In 1907, de Sola Pool was invited to become the rabbi of Congregation Shearith Israel — often called the Spanish and Portuguese Synagogue — located in New York City, the oldest Jewish congregation in the United States. He served as its rabbi for 63 years.

The National Jewish Welfare Board (JWB) was formed on April 9, 1917, three days after the United States declared war on Germany, in order to support Jewish soldiers in the U.S. military during World War Ⅰ. The impetus for creating the organization stemmed from Secretary of War, Newton Baker and Secretary of Navy, Josephus Daniels. The organization was also charged with recruiting and training rabbis for military service, as well as providing support materials to these newly commissioned chaplains. The JWB also maintained oversight of Jewish chapel facilities at military installations. In 1921, several organizations merged with the JWB to become a national association of Jewish community centers around the country in order to integrate social activities, education, and active recreation. These merged organizations included the YWHA, YMHA, and the National Council of Young Men's Hebrew and Kindred Association. In 1941, in a response to a mandate from President Franklin D. Roosevelt, six private organizations - the National Jewish Welfare Board, the YMCA, YWCA, the Traveler's Aid Association, and the Salvation Army - were challenged to handle the on-leave morale and recreational needs for members of the Armed Forces. On 4 February 1941, the six organizations pooled their resources and founded the United Service Organizations (USO). The National Jewish Welfare Board is now the JWB Jewish Chaplains Council, part of Jewish Community Centers (JCC) of North America. The JWB Jewish Chaplains Council sends prayer books, religious artifacts and supplies for Jewish holidays, including Passover Seder kits, Ḥanukkah candles, four species for Sukkot, and more.

Aharon Varady, founding director of the Open Siddur Project, is a copyright researcher and amateur book scanner. He prepares digital images and new digital editions of prayer books and related works in the Public Domain in order to make their constituent parts (prayers, translations, annotations, etc.) publicly accessible for collaborative transcription by project volunteers. (In some cases, he finds existing digital editions prepared by others that require correction and reformatting.) If you appreciate his efforts, please send him a kind note or contribute to his patreon account.