GZ Principal Kurt Zeidler, PhD, CEng gave a presentation at the World Tunnel Congress May 18-23, 2012 in Bangkok, Thailand.
A copy of the paper presented by Dr. Zeidler, Making Space in Urban Areas, can be found here.
Dr. Zeidler also chaired the technical session, Long and Deep Tunnels.

Other topics discussed at the WTC included:
Urban tunnelling
Use of underground spaces
Natural disaster mitigation and management through underground space use
Underground structure resistance against seismic loads
Advance and innovation in mechanised tunnelling
Conventional tunnelling
Long and deep tunnelling
Contract practices, commercial aspects and risk assessment
Tunnelling nearby sensitive structures
Tunnel rehabilitation and restoration
Safety in tunnels
Micro tunnelling
Deep excavations