Gegar Prasetya had major expertise in both scientific research and engineering work related to fluid dynamic, coastal structure, sediment transport and Tsunami hazard assessment in Indonesia and Pacific. He completed his PhD at Waikato University, New Zealand in the field of Earth and Ocean Sciences, and Master of Science with first class honor in Earth Science from the same university in 1997 majoring in Coastal Oceanography and Engineering with thesis and dissertation on Tsunami modelling and hazards analysis. He carried out a physical & numerical modelling of volcanic eruption based on Krakatau event 1883 with underwater explosion, pyroclastic flow and caldera collapse for his Master Thesis in 1997 and assessing the tsunamigenic region from both volcanic and earthquake for his PhD research and dissertation. He has more than 25 years of professional experience in a number of countries such as New Zealand, Japan, the Netherland, USA, Italy, Samoa, South America and ASEAN countries for research and engineering project. He involved in recent International Tsunami Survey Team (ITST) field survey on Sunda Strait 2018 and Palu 2018 Tsunami, Samoa 2009, Aceh Tsunami 2004 & 2005, Sulawesi - Tonggolobibi 1996, East Java 1994 and Flores Tsunami 1992. First hand experienced on tsunami was during the Sumba M8.0 1977 when his home island in Lombok was hit by tsunami when he was kid. He published his research work with his peers on several peer-review international journal.