Karl Kruszelnicki, is a scientist, who is best known as an author and science commentator on Australian radio and television. He is often referred to as Dr Karl.
He holds degrees in mathematics, biomedical engineering, medicine and surgery. He has also studied astrophysics, computer science, and philosophy. He has worked as a physicist, labourer, roadie for bands, car mechanic, filmmaker, hospital scientific officer, biomedical engineer, TV weatherman, taxi driver, and doctor. Kruszelnicki is the Julius Sumner Miller Fellow in the Science Foundation for Physics at the School of Physics, University of Sydney.