Tietjen, John H. Which Way to Lutheran Unity? A History of Efforts to Unite the Lutherans of America. Saint Louis: Concordia Pub. House, 1966.
John H. Tietjen (June 18, 1928 – February 15, 2004) was a Lutheran clergyman, theologian, and national church leader in the United States. He is best known both for his role in the Seminex controversy which roiled the Lutheran Church – Missouri Synod (LCMS) in the mid-1970s, and for his efforts on behalf of Lutheran unity that resulted in the formation of the Evangelical Lutheran Church in America (ELCA).1
1 http://en.wikipedia.org/wiki/John_Tietjen (accessed September 14, 2013)