Fluid Mechanics, Power Systems, Electromagnetics, Photonics, Electronics
Developed attosecond (10^-18 or a billion billionths of a second) light pulses for molecular imaging.
"Comparing one attosecond to one second is like comparing one second to the age of the universe."
Corkum is the father of attosecond laser imaging of molecules and atoms. Very good biographies exist at the University of Ottawa, at the Natural Sciences and Engineering Research Council of Canada and on Wikipedia. Also a great personal interview at the Royal Society of Chemistry.