She is the Australia Telescope National Facility Chief Scientist [1] and a Professor of Astrophysics in the School of Physics at the University of Sydney.
[3][4] Sadler is a member of the International Astronomical Union and served as the President Division VIII Galaxies & the Universe from 2009 to 2012.
[6] Sadler's interest in astronomy developed when she was eight years old and received a book with photographs of telescopes and the Universe, which "got [her] thinking about big questions.
"[7] With a team of colleagues, Sadler developed a radio atlas of the entire southern sky, using the University of Sydney's Molonglo Observatory Synthesis Telescope, which is now used by astronomers internationally.
"[4] In July 2015, Sadler's research team found a 5-billion-year-old galaxy using the CSIRO's Australian Square Kilometre Array Pathfinder.