Leopold Ullstein was the founder and publisher of several successful German newspapers, including B.Z. am Mittag and Berliner Morgenpost. Many of these are still published today. Ullstein was also the founder of the leading German publishing house Ullstein-Verlag.

The Ullstein Verlag was founded by Leopold Ullstein in 1877 at Berlin and is one of the largest publishing companies of Germany. It published newspapers like B.Z. and Berliner Morgenpost and books through its subsidiaries Ullstein Buchverlage and Propyläen.