Currently, Karoon Jantaransu holds the position of Chairman for K.C.S. & Associates Co. Ltd. Dr. Jantaransu is also on the board of Quality Construction Products Public Co., Ltd., BTS Group Holdings Public Co. Ltd., K.C.S. Consulting Engineer Co. Ltd. and Richy Place 2002 Public Co. Ltd.
In the past he occupied the position of Director & Chief Operating Officer at Bangkok Mass Transit System Public Co. Ltd., President of The Engineering Institute of Thailand, President of The Engineering Institute of Thailand, Head-Civil Engineering Department at the University of Chulalongkorn and Director & First Vice President at Council of Engineers of Thailand.
Karoon Jantaransu received an undergraduate degree from the University of Chulalongkorn and a doctorate and a graduate degree from The Ohio State University.