Over the last twenty years, global financial integration and global financial volatility have greatly increased. The 2008 crisis represented a peak in the vulnerability of all countries around the world with regard to global financial volatility. In response to this volatility and as the first line of defense, states have used a growing array of domestic tools: monetary policy, fiscal policy, financial regulatory reforms, domestic security market reforms, occasional capital controls, or the accumulation of financial reserves. Although the G20 was formed in 1999, it did not begin to take center stage in global economic governance until the global financial crisis that started in 2008. Since 2008, systemically important states - both established and aspiring powers - have taken the further steps of committing to increased global financial governance and becoming more integrated into the G20. East Asia is a region which contains a number of systemically important states, both existing economies and emerging ones. East Asian state actorsí involvement in the G20 is used as a case study to analyze the relevance of the unfolding G20 process. Does this G20 process matter? If so, what explains key statesí willingness to engage in it and accept new institutional constraints? What exactly drives the commitment process under the G20?