John was born in Ft. Worth, TX to Mary (Grote) and John Douglass Jennings, MD. He worked at Halliburton for 33 years. John was preceded in death by his parents. He is survived by his wife, Dolores; children, Matt & Laura Jennings, Kayleigh & Kirsten Jennings, Trae & Tami Wright, Jeremy & Katrina Wright; grandchildren, Tristen, Aden, Connor, Jaxon, Aubrey, Cohen, and Erick; sister, Mary S. Jennings, DDS; brother, James Jennings, DDS; and numerous other family members and friends. Visitation will be Sunday, March 27, 2016 from 1-8 pm with the family here to greet friends from 2-4 pm. Service to celebrate his life will be 1:00 pm, Monday, March 28, 2016 in the chapel at Buchanan Funeral Service with burial to follow at Resurrection Memorial Cemetery. In lieu of flowers, please send donations to the Oklahoma Alzheimer's Association.