HRGreen. We are proud to recognize engineers for creating new possibilities that contribute to a better quality of life and inspire future generations. Cedar Rapids | Des Moines HRGREEN.COM Toll Free 800.728.7805 HRGreen. We are proud to recognize engineers for creating new possibilities that contribute to a better quality of life and inspire future generations. Cedar Rapids | Des Moines HRGREEN.COM Toll Free 800.728.7805