What did alois senefelder and IRA rubel have to do with printing?

Alois Senefelder is best known for inventing lithography in the late 18th century, a revolutionary printing technique that allowed for the mass production of images and text from a flat surface, greatly influencing the fields of art and publishing. Ira Rubel, a 20th-century American entrepreneur, contributed to the printing industry by popularizing the use of offset lithography, which improved quality and efficiency in printing processes. Both figures significantly advanced printing technology, shaping how printed materials are produced and distributed.