Conrad Stacey is a Director of Stacey Agnew Pty Ltd in Australia, and Vice President of DELVE Stacey Agnew LLC in the US, practicing principally in tunnel ventilation and fire life safety. Besides many publications on tunnel matters, Conrad’s credits include seminal reports on livestock shipping heat stress risk, co-authorship of a paper on the gravitational energy drivers for the geodynamo, and for some years he maintained a patent on an ambidextrous boomerang. Recently, with Michael Beyer, Conrad has initiated the scientific discussion on the critical velocity to prevent smoke backlayering. Currently he is developing areas of research on the systematic study of museum boomerang collections, and the recording of knowledge on the indigenous approach to aerodynamic tuning of hunting boomerangs.