Art Wittmack, retired president and CEO of Neumann Brothers Inc., has been named interim president of the Taxpayers Association of Central Iowa. Wittmack, whose appointment was effective July 1, replaces Gretchen Tegeler, who accepted a position with the Iowa Healthcare Collaborative. “We are pleased to have [Wittmack] at the helm as we prepare for our second century of representing taxpayer interests,” board Chairman Matt Wagner said in a prepared statement. The association is a nonpartisan organization dedicated to the promotion of efficient and effective local government.