Jaroslaw Saturnin Leitgeber (18 November 1848 - 22 May 1933) was a Polish writer, bookseller and publisher.
His brother, also a book bookseller and publisher, Mieczyslaw Antoni Leitgeber, inspired his career.
Jaroslaw got his experience by working with his brother, interrupted only by military service in 1869.
A year later, in 1870 he traveled to Lipsk to learn book printing at Baer and Hermann Publishing.
He returned to Poznan in 1873 and opened his own book printing company using his father's inheritance.
Leitgeber's most successful periodical was Kalendarz Poznanski published continuously from 1873 till 1901 and replaced with the new Nowy Kalendarz Poznanski published for the next 30 years.
Jaroslaw Leitgeber wrote books, especially historical for teenagers, under the alias "Jan Tworzymir".Leitgeber made his living as the bookseller from 1866 till the end of his life and owned a bookstore in Poznan by his own name.
From 1876 to 1903 he ran a printing house.
Since 1873 he was publishing Kalendarz Poznanski.
From 1910-18 he was a chairman of Association of Polish Booksellers in Germany (Zwiazek Ksiegarzy Polskich na Rzesze Niemiecka).