Yao was pressured to enter the NBA draft in 1999 by Li Yaomin, the deputy general manager of the Shanghai Sharks. Li also influenced Yao to sign a contract for Evergreen Sports Inc. to serve as his agent. The agreement entitled Evergreen to 33% of Yao's earnings, but the contract was later determined to be invalid.  When Yao decided to enter the 2002 NBA draft, a group of advisers was formed that came to be known as "Team Yao". The team consisted of Yao's negotiator, Erik Zhang; his NBA agent, Bill Duffy; his Chinese agent, Lu Hao; University of Chicago economics professor John Huizinga; and the vice president for marketing at BDA Sports Management, Bill Sanders. Yao was widely predicted to be picked number one overall. However, some teams were concerned about Yao's NBA eligibility because of uncertainty over whether the CBA would let Yao play in the United States.  Shortly after Wang Zhizhi refused to return to China to play for the national team and was subsequently banned from playing for China, the CBA stipulated that Yao would have to return to play for the national team. They also said they would not let him go to the United States unless the Houston Rockets would take him first overall. After assurances from Team Yao that the Rockets would draft Yao with their number one pick, the CBA gave permission on the morning of the draft for Yao to play in the U.S. When the Rockets selected Yao with the first pick of the draft, he became the first international player ever to be selected first overall without having previously played U.S. college basketball.

Answer this question "What else did he do outside of the NBA?" by extracting the answer from the text above.
Wang Zhizhi refused to return to China to play for the national team and was subsequently banned from playing for China,