Fagerberg is an associate professor of theology at the University of Notre Dame. He was the former acting director and associate professor of liturgical studies at the Liturgical Institute, University of St. Mary of the Lake/Mundelein Seminary, Mundelein, Illinois. He holds an MDIV from Luther Northwestern Seminary; an MA in liturgical studies from St. John's University, Collegeville; an STM from Yale Divinity School; and a PHD in liturgical theology from Yale University.