A Medford area developer has been convicted of 17 counts of securities fraud and aggravated theft. Tony Green with the Oregon Attorney General's Office says James C. Nistler targeted seniors, with some losing their life savings. Nistler was a high-ranking U.S. Department of House Official in the late 80s. He was convicted of a scheme involving a proposed housing development in Medford. Attorney General John Kroger called it a complex Ponzi scheme. Nistler will be sentenced December 9th in Medford.