He subsequently engaged in graduate studies in Systematic Theology at Garrett–Evangelical Theological Seminary at Northwestern University, and settled in Wilmette, Illinois, where he and Kay raised three children.
seminary | Evangelical Lutheran Church in America | Union Theological Seminary | Seminary | Jewish Theological Seminary of America | Jewish Theological Seminary | Princeton Theological Seminary | Virginia Theological Seminary | Evangelical Church in Germany | Lutheran Theological Seminary | Wyoming Seminary | Graduate Theological Union | Association of Evangelical Lutheran Churches | Southwestern Baptist Theological Seminary | Rabbi Isaac Elchanan Theological Seminary | Pittsburgh Theological Seminary | McCormick Theological Seminary | Fuller Theological Seminary | Woodstock Theological Center | St. Mary's Seminary and University | St. John's Seminary | Southern Baptist Theological Seminary | Oak Hill Theological College | Moore Theological College | Harvard Theological Review | Evangelical Church of West Africa | Evangelical Alliance | Crozer Theological Seminary | Concordia Seminary | Addiscombe Military Seminary |
Hollinger previously held academic appointments at Evangelical Theological Seminary in Myerstown, Pennsylvania, Messiah College in Grantham, Pennsylvania, Associated Mennonite Biblical Seminary in Elkhart, Indiana, and Alliance Theological Seminary in Nyack, New York.