Thank you for your service to the public at the City of Dallas. This page contains information as you leave your employment with the City.The Dallas County Administrative Code contains the employment policies and procedures for Dallas County. A director resignation letter is a statement that declares your intent to leave your position as the director of a board, company or other organization. Org or call 972-925-4300. Under the Texas Education Code, contract employees are required to resign no later than 45 days before the first day of instruction for the school year. Dallas City Newsroom I Having trouble viewing this email? Fill out the requested information and click Submit. Vernell Sturns, outgoing executive director of Dallas-Fort Worth International Airport, confirmed he. The executive director of the Dallas County Juvenile Department resigned Friday.