Pastor John was born in Bethany Oklahoma (where he lives currently) and graduated from Woodward High School in 1984. He attended the University of Central Oklahoma. John married Michelle Heierding in 1989, and they have two adult daughters (Kaley and Bryce). The Brennan’s are members of First Lutheran and both daughters were baptized here.

Prior to entering the ministry, John worked as a manager in the restaurant and grocery industries. He attended the Association of Free Lutheran Congregations (AFLC) seminary and prior to returning to First Lutheran, he served as the pastor of St. Peter Free Lutheran church in Melvin, Illinois from 2005 to 2020.

Michelle is currently an elementary art teacher in OKC, and taught science in Illinois.