Douglas David Humphreys, III,   Services for Douglas David Humphreys, III were held at 1:00 p.m. Monday, February 22, 2010 at McDonald Funeral Home. Mike Nolen, pastor of First Baptist Church, officiated. Burial took place in Swiss Cemetery.   Mr. Humphreys, 81, died February 18, 2010 at Ft. Walton Beach Medical Center in Ft. Walton Beach, Florida.  Doug was born in Hohenwald, on October 3, 1928 to the late Honorable Douglas David Humphreys, Jr. and Elise Hinson Humphreys.  After serving his country in the United States Army, Doug returned to Nashville, with his wife, the late Patsy Lewis Humphreys, where he attended Peabody/Vanderbilt University. He completed his Masters Degree in mathematics, and while working on his Doctorate took a teaching job with McCallie private boys school in Chattanooga.  His daughter, Teresa Humphreys Holden, was born. Doug was then offered a teaching position with the prestigious Indian Springs private school near Birmingham, Alabama, where he taught math, directed the glee club, and designed a student convocation building for the school.  Two more daughters, Janet Humphreys and Nancy Humphreys Jones, were born. Wanting to always provide the best for his family and seeing an opportunity to use his math skills in the new space program and the developing computer age, he made a career change and moved the family to Huntsville, Alabama.  In Huntsville, he helped develop the first mainframe computers for NASA, helped to return the Apollo 13 astronauts to earth, and worked on the Strategic Defense Initiative or “Star Wars” program.  In Huntsville, a son was born, David Douglas Humphreys IV. Working on many government contracts led him eventually to the Florida gulf coast area of Destin/Fort Walton Beach, Florida.  After retiring in 1994, he could be found in his short pants and Birkenstock sandals year round.  Doug leaves behind daughters; Teresa Holden and her husband, Graham, , Janet Humphreys and her husband, Mark Izard, and Nancy Jones and her husband, Jericho, a son, David Douglas Humphreys IV and wife, Leslie; granddaughters, Shanna, Rhiannon, and Madison; great-granddaughter, Lily; and his dear friend of almost thirty years, Gene Jorgenson.  He was preceded in death by his father, Douglas David Humphreys Jr., his mother, Elise Hinson Humphreys, his wife, Patsy Lewis Humphreys, his bother, Boyd Humphreys, and his sister, Andeline Humphreys.