Professor Clarke was a Human scientist in the 21st century and a colleague of Dr. Ivan Kintobor and Dr. Niven. Professor Clarke assisted in the creation of the Alpha 100 Series robot Isaac by creating the robot's hardware around the time the Xorda's emissary came to Earth. He along with the vast majority of human population was wiped out by the Xorda's attack on the planet, though Isaac and Dr. Kintobor managed to survive. (StH: #148)

It is unknown if Professor Clarke took part in the dissection of the Xorda emissary or not.