Hamidaddin joined STA as CEO in March 2020. In November 2023, the Bureau International des Expositions announced Riyadh as the host city for the Expo 2030. Hamidaddin’s previous roles include chief of investment, strategy, and tourism marketing for the Saudi Ministry of Tourism and chief commercial officer at King Abdullah Economic City. He is also a member of the board of trustees for Prince Mohammad bin Salman College for Business and Entrepreneurship and a board member of the Qiddiya Investment Company, the Saudi Conventions and Exhibitions General Authority, and other government committees.