In 1975, Gates and Paul Allen launched Microsoft, which became the world's largest PC software company. [a] Gates led the company as chairman and CEO until stepping down as CEO in January 2000, but he remained chairman and became chief software architect. In June 2006, Gates announced that he would be transitioning to a part-time role at Microsoft and full-time work at the Bill & Melinda Gates Foundation, the private charitable foundation that he and his wife, Melinda Gates, established in 2000. He gradually transferred his duties to Ray Ozzie and Craig Mundie. He stepped down as chairman of Microsoft in February 2014 and assumed a new post as technology adviser to support the newly appointed CEO Satya Nadella.