Zygmunt Edward "Ziggy" Switkowski, AO FAA FTSE (born 1948), is a Polish Australian business executive and nuclear physicist. His most public role was as the chief executive officer of Australia's largest telecommunications company Telstra from 1999 to 2004. During his tenure, he oversaw the privatisation of the then government-owned corporation through a series of public tranche sales (known as the T1, T2 and T3 sales). Currently, he is the chairman of both NBN Co and Suncorp, a director of Healthscope, Oil Search and Tabcorp and the Chancellor of the Royal Melbourne Institute of Technology (RMIT University).