2011–Present: Ordinary Professor of Systematic Theology, The Catholic University of America
2010 or 2011: received into the Catholic Church
2006–2015: Executive Director, Center for Catholic and Evangelical Theology
2003–2011: Professor of Systematic Theology (also Dean and Vice President for Academic Affairs, 2003–9), Lutheran Theological Southern Seminary, Columbia, SC
1998–2003: Edward C. Fendt Professor of Systematic Theology, Trinity Lutheran Seminary, Columbus, Ohio
1988–1998: Research Professor; Director (1991–93; 1995–97), Institute for Ecumenical Research, Strasbourg, France
1980–1988: Assistant (1980–84) and Associate (1984–88) Professor of Systematic Theology, Lutheran Theological Southern Seminary
1978–80: Instructor in Religion, Davidson College, Davidson, North Carolina
1979: Ph.D., in Religious Studies – Theology; Yale University
1977: M.Phil., Yale University
1974: M.A., Yale University
1973: A.B., Dartmouth College (Summa Cum Laude, Salutatorian)
Editorial board, Brazos Theological Commentary on the Bible, 2003–present
Associate Editor, Pro Ecclesia, 2006–Present
Editorial Advisory Board, Ecclesiology, 2006–2015
Board of Directors, Center for Catholic and Evangelical Theology, 2016–present
Academy of Catholic Theology (Board member), 2017–2019
Member, USA Lutheran–Catholic Dialogue, 1998–2010, 2013–present
Member, International Lutheran–Catholic Dialogue, 2008–2010
Drafting committee for Lutheran–Episcopal full communion agreement, Called to Common Mission, 1997–99
Drafting committee to revise Lutheran–Roman Catholic Joint Declaration on the Doctrine of Justification; 1995–96.
Member, Anglican–Lutheran International Joint Working Group, 1999–2002
Faith and Order Commission Observer, Anglican-Roman Catholic International Commission (ARCIC II), 1995–1998
Ecumenical member, Inter–Anglican Theological and Doctrinal Commission, 1994–1996
Consultant, Anglican–Lutheran International Commission, 1988–1996
Member, Lutheran–United Methodist Dialogue, 1984–1987