1. Head of Soil Mechanics Laboratory, Pelita Harapan University, Department of Civil Engineering, UPH Tower, Lippo Karawaci, Tangerang 15811, Banten, Indonesia
2. Associate Professor, Virginia Polytechnic Institute and State University, The Charles E. Via, Jr., Department of Civil and Environmental Engineering, 200 Patton Hall, Blacksburg, VA 24061-0105
3. President, Geopier Foundation Company, Inc., 200 Country Club Drive, Suite D-1, Blacksburg, VA 24060