NASA rejected Karl as non-astronaut material so he walked into ABC Radio station Double J and offered to talk about the Space shuttle launch instead.  They said ‘Okay’ and his radio career took off like a rocket.  ‘Great Moments In Science’ ran on Double J from 1981, while Karl moonlighted as a medical student.

Since then, his media career has exploded to include TV, books, newspapers, magazines, scripting, professional speaking, and of course, the Net.

Karl made his TV debut in 1985 as the presenter of the first series of Quantum. Since 1986 he has reported science on the Midday Show, Good Morning Australia (including a full-time stint in 1991-2 as the TV Weatherman and science reporter), the Today Show and Sunrise. Along side his fellow geek Adam Spencer, he has written and co-produced two series of Sleek Geeks for ABC TV.

Karl talks science on ABC radio stations across Australia and, on the BBC, for several hours each week.  The original talk back programme still runs each Thursday on JJJ from 11am to midday.

In 2012 Karl was delighted to have Asteroid 18412 named after him. Asteroid Dr Karl/18412 was discovered by Robert H. McNaught, on June 13, 1993 at the Siding Spring Observatory in Coonabarabran, New South Wales, Australia.

Karl has degrees in Physics and Maths, Biomedical Engineering, Medicine and Surgery and has worked as a physicist, tutor, taxi driver, film-maker, car mechanic, labourer, and as a medical doctor.

He is the author of 36 popular science books, with more on the way.

Dr Karl is currently the Julius Sumner Miller Fellow at the University of Sydney.

Dr Karl says: Apply for ISS2015: BIG!

download Karl’s big CV

If you’re doing a school project on Dr Karl, or just keen to swat up on your Karl stats, then here’s pretty much all the information you’ll be needing. Click below to download Dr Karl’s full CV – better put aside a couple of hours though, it’s a lengthy read…



Sleek Geeks

After years of working together on stage and screen, they’ve come together for the very first time in podcast format. Sleek Geeks mix science with humour as they set out to answer some of the perplexing scientific mysteries we encounter on a daily basis. Download, subscribe and enjoy this highly entertaining science-fuelled knowledge whirlwind and, as the Sleek Geeks like to say: “Learn something without even noticing…”
Ask @sleekgeeks a question


Triple J – Science on Mornings

Dr Karl’s famous triplej mission is to bring science to the peeps! Join host Zan Rowe, her guests, and a bunch of curious Triple J listeners for a weekly injection of science, myth-bashing and answers!


ABC Great Moments in Science

Great Moments In Science has been airing on ABC radio for over 20 years.  It is piped out via the ABC to local radio stations across the country on a weekly basis – except for late in the year when we attempt to take a break like ‘normal’ people… Subscribe today and get your no dollar$ worth!


BBC Five Live Science

Dr Karl answers listeners’ science questions on BBC Radio 5 Live’s Up All Night programme with Rhod Sharp. Dr Karl broadcast live on Thursdays at 3am.



(ABC appearances in local times)

Alternating Wednesdays 09:00-09:30 (QLD Time)
Dr Karl joins Phil Staley on ABC FNQ Mornings (fortnightly)
Dr Karl joins Paula Tapiolas on ABC Townsville (fortnightly)  

Weekly from 09:30 – 10.00 (QLD Time)
Dr Karl joins Nicole Dyer on ABC Gold Coast Mornings  

Weekly from 10:30 – 11:00 (SA Time)
Dr Karl joins Ian Henschke ABC Adelaide




Triple J  

THURSDAY 11.00-12.00
Dr Karl joins Zan Rowe on Mornings, for a blistering one-hour science talkback. Listen live on Triple J, or subscribe to the podcast.

Other regular THURSDAY ABC appearances
(in local times)

Weekly from 09:30-10:00 (QLD Time)
Dr Karl joins Steve Austin on ABC 612 Brisbane  

Fortnightly from 10:00-10:30 (NSW Time)
Dr Karl joins Linda Mottram on ABC 702 Sydney  

Weekly from 14:00 – 14:30 (NT Time)
Dr Karl joins Kate O’Toole on ABC 105.7 Darwin  

Weekly from 14:00-14:30 (WA Time)
Dr Karl joins Giliian O’Shaughnessy ABC 720 Perth (WA)  

Weekly from 15:30-16:00 (QLD Time)
Dr Karl joins Mary-Lou Stephens on ABC Sunshine Coast (QLD)  

BBC Radio  

Thursday Weekly from 0300-0400 (UK Time)
Dr Karl answers listeners’ science questions on BBC Radio 5 live’s Up All Night programme with Rhod Sharp. Dr Karl broadcast live on Thursdays at 3am.The Podcast is available after broadcast

House of Karls Out Now!

Contact Karl

1 Follow Dr Karl on Twitter, as he seems to answer questions quite often

2 You can also call into Triple J (Thursday AEST 11.00-12.00) and ask your question live during the show. Just call 1300 0555 36

3 If you’d like to book Dr Karl for your event? Please contact his agent, Claxton Speakers International, on 02-9909-0033 or email: drkarl@claxtonspeakers.com