Hunsinger worked as volunteer teacher, Benhaven School for Autistic Children in New Haven, CT in the period of 1973–1975.
After he received a MA and MPhil degree from Yale University in 1977, he served as the "Theologian in Residence " in Riverside Church Disarmament Program in NYC between 1978 and 1979.
Hunsinger also served as visiting professor of Union Theological Seminary (NYC) (1979), Haverford College (1985), Andover Newton Theological School (1997-2004), Princeton University (2000) He took the role of program chair (1997-2002) and the president (2003–present) of the Karl Barth Society of North America (KBSNA).
Previous recipients include Eberhard Jüngel, Hans Küng, John W. de Gruchy, Johannes Rau, and Bruce McCormack.
He walked the picket lines with Cesar Chavez, worked for William Sloane Coffin Jr. at the Riverside Church Disarmament Program, and was twice arrested with Daniel Berrigan in Good Friday protests against nuclear weapons in Manhattan.
[2] He served as a delegate to the official Reformed/Roman Catholic International Dialogue (2011-2016), where he was instrumental in prompting the World Communion of Reformed Churches (WCRC) to affiliate with the historic "Joint Declaration on Justification" (JDDJ).