He was born June 30, 1938 in Rockport, MO. He was the son of Hadley and Lilly Clark. As a child he and his family moved to Joplin, MO. Hadley married Jeannine Roderique of Carl Junction, MO, they moved to Tyler, TX where they lived for 5 years before moving to Pasadena, TX.
Hadley was an employee of Brown and Root for 28 years until he retired at age 55. He is survived by his wife Jeannine, daughter , Julie Cloninger, and grandsons, Jeremy Galloway and Cody Cloninger. Also survived by his sister, Maxine Thompson and brother, Jerry Clark. Proceeded in death by his parents, and sons, Dennis and Mickey Clark, brothers, Jim and Bruce Clark, and brother-in-law Beauford Thompson.
He had many hobbies which included golfing, gardening, volunteering at Red Bluff Elementary, coaching girls softball, and ushering at church.