Natrona county school district superintendent Dr.Joel Dvorak announced his intention to retire next summer. June 30th 2013 will be Dvorak's last day. He made the surprise announcement at the close of Monday’s school board meeting. Dvorak says he wants to give the district plenty of time for the transition and believes this is the best time to get the process moving.Dvorak has been with the district for 10 years, the last five serving as Superintendent.