Darling is a graduate of the Baylor Law School (1977) and Baylor University (BA 1975). Some of his current leadership roles in the community include Chairman, Lower Rio Grande River Water Authority; Board Member, Region M Water Planning Group; Board Member, McAllen Economic Development Corporation; Board Member, McAllen Foreign Trade Zone, Inc.; Chairman Hidalgo-McAllen International Bridge Board; Chairman, Anzaldúas International Bridge Board, and President,Texas Municipal League, Region 12. He has served as mayor for two terms.