Susan Jane Duncan was born 2 November 1872 in Woodruff, Rich County, Utah Territory and was one of seven children to John Thomas and Martha Jane Lewis Duncan. Her father John Thomas died tragically from a sawmill accident when she was six years old with chickenpox in February 1878. Her younger sister was born a few months after her father's death. Susan attended one-room school building in Bountiful and a new high school later known as the Stroker School. In 1889 she attended the McGurrin's Shorthand College in Salt Lake City.
She married Amasa Lyman Clark on 31 March 1897 in Salt Lake City. Susan instantly became a mother of three boys, Amasa Sterling, Herald and Grant from Amasa's first marriage. Susan and Amasa had five children, two daughters, Phyllis and Nell and three sons, Julian, Dale and Lewis. She was instrumental in getting the new Davis High School centrally located in the county. Susan was one of the original organizers of the Parent-Teacher Association and involved many years in education. She served Davis County Recorder and was a private secretary to Simon Bamberger before he became governor of Utah. Susan was a member of The Church of Jesus Christ of Latter-Day Saints and wrote articles to The Children's Friend magazine. She served in the first Primary Association in Bountiful. While she was PTA president of the Farmington she planned the volunteer school lunch program that was adopted by the county and the state school boards.
In December 1958 her Christmas memory was published in the series "The Christmas I Remember Best". Susan passed way on 3 August 1965 at the age of 92.