Home Economic Development County IDA chief, GOP aide named to new posts Economic DevelopmentGovernmentPremium ContentWestchester County IDA chief, GOP aide named to new posts By John Golden - March 22, 2013 Eileen Mildenberger, who served two years as executive director of the Westchester County Industrial Development Agency (IDA), has been named the county’s director of economic development. She will be replaced at the helm of the IDA by Jim Coleman. This content is for Westfair Online members only. Please Sign in / Join to view this content. Become a member by Registering Here.