Dr. Sigl graduated as Diploma Engineer (MSc) in 1985 from the Technical University of Graz (Austria), in geotechnics and soil mechanics and in 1991 he achieved the PhD in mining engineering at the Mining University of Leoben (Austria). Oskar’s 30 years of experience cover a wide range of projects such as subways, railways, roads, power transmission cables, sewerage mains, underground storage schemes and caverns. Oskar has been working in Singapore since 1997, where he was involved in the detailed design of almost all major underground infra structure projects. This includes the MRT lines, high voltage transmission cable tunnels, underground expressways and deep sewer tunnels. Outside of Singapore, Dr. Sigl was involved in leading roles in the design of underground transportation systems in Dubai, Perth, Brisbane, Sydney, Hong Kong, Kuala Lumpur as well as the design of underground oil and fuel storage cavern schemes in Saudi Arabia, India and the UAE.

Dr Wong Kai Sin specialises in geotechnical engineering. His areas of specialisation are deep excavation, building foundation, soil improvement, land reclamation, slope stability, ground settlement, site investigation, site characterisation, soil testing and soil-structure interaction problems. Dr Wong graduated in 1972 with a BS degree from the University of Illinois. He received his MS and PhD degrees from the University of California at Berkeley in 1975 and 1978 respectively. He practiced geotechnical engineering in California before joining NTU in 1984. He left NTU in 2010 and is currently teaching at SIT as well as actively participating in consultancy works.