Fra Luca Bartolomeo de Pacioli (sometimes Paccioli or Paciolo; 1445–1517) was an Italian mathematician, Franciscan friar, collaborator with Leonardo da Vinci, and seminal contributor to the field now known as accounting. He is referred to as the Father of Accounting and Bookkeeping (he was the first to publish a work on double-entry system of book-keeping).[2] He was also called Luca di Borgo after his birthplace, Borgo Sansepolcro, Tuscany. [3]