Professor Mills conducts research in Operations Management. He studies service systems with a particular emphasis on healthcare. His research focuses on healthcare system response to disruptions, demand management, allocation of healthcare provider resources, and economic issues in healthcare. His recent work has been published in prestigious journals including Operations Research, and Production and Operations Management. His working paper was named the 2018 Best Paper by the College of Healthcare Operations Management, Production and Operations Management Society. Professor Mills is also the recipient of the prestigious Indiana University Trustees Teaching Award in 2015.