His primary research interests are in the areas of geographical visualization and visual analytics focusing on homeland security, public health, dietary analysis, social media, criminal incident reports, and the food-energy-water nexus. He has served on the organizing committees for the IEEE Conference on Visual Analytics Science and Technology and the IEEE/VGTC EuroVis Conference. Dr. Maciejewski is a recipient of an NSF CAREER Award (2014) and was recently named a Fulton Faculty Exemplar and Global Security Fellow at Arizona State. His work has been recognized through a variety of awards at the IEEE Visual Analytics Contest (2010, 2013, 2015) and a best paper award in EuroVis 2017.