Kenneth Wayne Brown and his wife, Leah Michele Brown, were found guilty Thursday in Dallas federal court. Authorities say they and others cashed in checks written to themselves.
The conspiracy involved several other people and led to about $2 million in losses for Garland.
Most of the proceeds went to Patricia Leathers, a former risk management adjuster for the city. Leathers pleaded guilty two years ago to conspiracy. She is serving a nearly five-year prison sentence.
Kenneth and Leah Brown will be sentenced May 18. Each faces up to five years in prison.