[1][2] He founded and is the executive director of The Sydney Institute, a privately funded Australian current affairs forum.
[3] Henderson was educated at Melbourne's Catholic, Jesuit-run Xavier College, one of the city's elite private schools.
Henderson taught at the Tasmania and La Trobe universities before working for four years on the staff of Kevin Newman in the Fraser government.
In 1994, Henderson profiled former prime minister Bob Hawke for the ABC TV program Four Corners.
[2] He was a regular political commentator on radio, and appeared occasionally on Insiders, another ABC TV program.