Kirby was born on October 30, 1943 in San Antonio, Texas. He grew up near Rochelle, Texas in McCulloch County on a dairy/livestock farm. He met Lynn on a blind date for a football game at Texas A&M during the fall of his senior year. He has a Bachelor of Science degree in Dairy Science and Agronomy and a PhD. in Plant Physiology. Kirby served as an Infantry officer in Vietnam and later served in the Texas Army National Guard for 9 years.
Kirby and Lynn were married on August 27, 1966. They have three children: Kathy Crockett of Lubbock, Kip Huffman of Big Spring and Karin Kuykendall of San Angelo. They also have 5 super grandchildren: Calley and Maddy Crockett, Bill Huffman and Sam & Kaitlin Kuykendall.
Kirby has been a member of Sunset from 1994 to 1996 and from 1998 to present. He has been an elder since July 2011.
Kirby enjoys working with livestock and hunting. His favorite foods are any of the great meals his wife cooks, especially chicken fried steak and venison with gravy.