Do we like Karl Kruszelnicki?
Our score: 9 out of 10. Decades of using his platform against health and climate disinformation, with no harmful words of his own turning up, though the record on his private conduct is thin.
Dr Karl is the only child of Holocaust survivors who fled to Australia in 1950, and by his own account he was a shy Polish immigrant kid. His early jobs include physicist at the Port Kembla steelworks, ditch digger, rock band roadie, taxi driver and filmmaker, before he trained as a doctor at a Sydney children's hospital. He applied to be a NASA astronaut, was knocked back for not being American, and broadcast the first space shuttle launch on Triple J instead.
That scattered path explains the man: curious about everything and happy to say so on air. His 48th book is a memoir, A Periodic Tale, and he told The Senior he wants his life “driven by curiosity, generosity and optimism”. Fair enough, mate.
The harm check comes up clean. We found no words of his own about trans people, LGBTQ+ people, women or migrants, and nothing on who he keeps working with that raises a flag, though the coverage we found is mostly profiles and event listings. What he is on the record doing is the opposite of a slide into grievance: he describes a well-funded, three-decade disinformation campaign aimed at obscuring climate change, and his one-line answer is “keep fossil carbon in the ground”.
He also takes on the cranks directly. When One Nation senator Malcolm Roberts disputed a temperature-record video Dr Karl had shared, claiming the data had been manipulated, Dr Karl answered with a flat “Incorrect” and a link. That was in 2017, and Roberts then challenged him to a debate.
His current project is a bigger swing. He is putting together AI experts and psychologists to build a chatbot aimed at changing minds on misinformation, because it matters, in his words, “Because it kills people”. He puts deeply held false beliefs down to a sense of tribe, which is a kinder reading than most would manage.
On the good side, he won UNESCO's Kalinga Prize for the Popularisation of Science in 2019, and his university said it is continually amazed by his energy. Nothing recent has blown up around him, and a search for court cases or serious allegations turned up nothing. The gap is that the record on how he treats people day to day is thin, so this is a verdict on his public life.