As earlier reported by ZDNet Australia, Twomey was a leading contender for the hot seat.
According to an ICANN statement, the managing director of Australian Internet consulting firm, Argo Pacific, will replace current president and CEO, Stuart Lynn, who is retiring after a two-year tenure.
"I'm very pleased that he will be the next ICANN president, following a thorough and global search," said Vint Cerf, the organisation's board chairman.
Twomey was elected as chair of ICANN's Government Advisory Committee in 2001. He also served as the CEO to the Australian government's National Office of the Information Economy from 1998 to 2000.
