Dennis Clell Pierson (affectionately known as D'dad), age 81 of Irving, Texas, passed away on April 29, 2020, in Denton, Texas.

A private graveside service was held on Monday, May 4, 2020, at Cherokee Municipal Cemetery with Pastor Bryan Laramore of the First Baptist Church officiating under the direction of Lanman Funeral Home Inc. in Cherokee, Oklahoma.

Dennis was born in Muskogee, Oklahoma, to Lee Clell and Theone Pierson on October 30, 1938. He graduated from Pawhuska High School in 1958, attended NWOSU and received his associate degree in electronic engineering from Oklahoma State Univers...