When Merle Albert Mook was born on 19 August 1909, in Waco, York, Nebraska, United States, his father, Simon C. Mook, was 23 and his mother, Emily Amelia Bristol, was 34. He married Carolyn Ellen Johnson on 14 November 1937, in Cozad, Dawson, Nebraska, United States. In 1940, at the age of 30, his occupation is listed as farmer in Stockton Election Precinct, Lancaster, Nebraska, United States. He died on 26 August 1983, in Nebraska, United States, at the age of 74, and was buried in Lincoln, Lancaster, Nebraska, United States.