J ason Jiang, also known as Jiang Nanchun, is a self-made Chinese billionaire who is the founder and chairman of Focus Media, China's largest and most dominant out-of-home advertising company. He pioneered a new form of advertising in China by building a massive network of digital advertising screens in high-traffic, elevator media locations, such as office buildings, apartment complexes, and shopping malls.

He founded the company in 2003, and it grew at a phenomenal rate, capitalizing on the massive urbanization of China and the desire of major brands to reach affluent urban consumers. He took the company public on the NASDAQ, then took it private, and then re-listed it on the Shenzhen Stock Exchange. His business has been through a number of cycles and has faced scrutiny from short-sellers, but he remains the controlling shareholder and the visionary behind the powerful advertising empire he created.