Over the past 36 years, Al Sayegh served in key roles in support of Abu Dhabi Government's strategy to drive the nation's economic diversification plan and ensuring the sustainability of the UAE in the future. His roles included Founding Chairman of Aldar Properties, the Founding Chairman of Abu Dhabi Future Energy Company (Masdar), Deputy Chairman of First Gulf Bank, and held senior positions in Abu Dhabi National Oil Company (ADNOC) and Abu Dhabi Investment Company (Invest AD).