Bishop Seitz was born in Milwaukee, Wisconsin on January 10, 1954 but has lived in the Diocese of Dallas since 1972 when he began his priestly formation at Holy Trinity Seminary in Irving. He was ordained to the priesthood on May 17, 1980. He was named a Prelate of Honor (Monsignor) by His Holiness Pope John Paul II in December 2004. He was ordained as an auxiliary bishop of the Diocese of Dallas in April of 2010.
See Tantamergo's post on this, too - as he is in the Dallas area, he has some experience of Bishop Seitz.