Jacob Micyllus, was a German Renaissance humanist and teacher, who conducted the city's Latin school in Frankfurt and held a chair at the University of Heidelberg, during times of great cultural stress in Germany.
Jacob Needleman was an American philosopher, author, and religious scholar.
Jacob Neusner was an American academic scholar of Judaism. He was named as one of the most published authors in history, having written or edited more than 900 books.
Saint Jacob of Nisibis, also known as Saint Jacob of Mygdonia, Saint Jacob the Great, and Saint James of Nisibis, was the Bishop of Nisibis until his death.
Jacob Piatt Dunn Jr. was an American historian, journalist, and author. A political writer and reformer, Dunn worked on ballot reform issues based on the Australian ballot system, authored a new Indianapolis city charter, and served as adviser to Indiana governor Thomas R. Marshall and U.S. Senator Samuel M. Ralston.
Jacob Post (1774–1855) was an English Quaker and a religious author. He wrote accounts of two founding Quakers: George Fox and William Penn.
Jacob Qirqisani was a Karaite dogmatist and exegete who flourished in the first half of the tenth century. His origins are unknown. His patronym "Isaac" and teknonym "Joseph" reflect no more than the genealogy of the biblical patriarchs, while his surname has been taken as referring to either ancient Circesium in eastern Syria, or Karkasān, near Baghdad, though no Karaite community is known in either place. He seems to have traveled throughout the Middle East, visiting the centers of Islamic learning, in which he was well-versed.
Jacob August Riis was a Danish-American social reformer, "muckraking" journalist, and social documentary photographer. He contributed significantly to the cause of urban reform in America at the turn of the twentieth century. He is known for using his photographic and journalistic talents to help the impoverished in New York City; those impoverished New Yorkers were the subject of most of his prolific writings and photography. He endorsed the implementation of "model tenements" in New York with the help of humanitarian Lawrence Veiller. Additionally, as one of the most famous proponents of the newly practicable casual photography, he is considered one of the fathers of photography due to his very early adoption of flash.
Jacob Samuel Speyer was a Dutch philologist and translator from Sanskrit.
Jacob Sprenger was a Dominican inquisitor and theologian principally known for his association with a well-known guide for witch-hunters from 1486, Malleus Maleficarum. He was born in Rheinfelden, Further Austria, taught at the University of Cologne, and died in 1495 in Strasbourg.
