James Patrick Brennan, 70, of Chattanooga, passed away Friday, October 21, 2011 in Nashville. A native of St. Louis, he was a resident of Wallingford, CT for 27 years before moving to Chattanooga. He was a graduate of University of Indiana where he received his PhD in Chemistry. He was of the Catholic faith and was a Senior Consulting Scientist with Arch Chemicals for 38 years. He is survived by his wife, Patti Brennan; three sons, Brian and wife Liz, Chris and wife Jana and Jay and fiancé Heather. Papa Jim is also survived by four grandchildren, Katie, Cassie, Erin and Sean; sister, Mary Ann Venegoni. Funeral services will be held at 1 p.m. Monday in the funeral home chapel. The family will receive friends from 4-7 p.m. Sunday at the East Brainerd Chapel of Chattanooga Funeral Home, Crematory & Florist, 8214 E. Brainerd Road.