Andrew Scott Unger, b. 1982 in St. Catharines, Ontario, and Matthew James Unger, b. 1984 in Hillsboro, Kansas, are historians, anthropologists, political theorists, artists, and authors who together wrote Codex Adma, a comprehensive record of the traditions, cultures, heroes, and histories of a fictional world called Atmos. 
The Unger brother spent their formative years in Hillsboro, a small rural town in central Kansas. As they grew they developed their imaginations through collaborative storytelling, devising tales set in an intricate world based largely on their quiet, rural neighborhood. The brothers' interest in folklore continued though their youth and into adulthood.
​Both Andrew S. and Matthew J. Unger are graduates of Tabor College, where they studied history, religion, and political science under the tutelage of Dr. Richard Kyle. Through the course of these studies the two traveled extensively throughout Western Europe and Southeast Asia, visiting numerous historical and religious landmarks, and such cultures as the remote Dayak tribe in the forested mountains of Sarawak, with whom they lodged for a time.
Andrew later studied literature and Czech History at Charles University in Prague, mentored there by the late great Professor Jan Wiener, Jewish hero of World War II, renowned bomber of the RAF, scholar, and civic reformer, from whose vast experience and charismatic storytelling Andrew gleaned a great deal. While Matthew, in his continued research of Pre-Incan civilization, has in recent years set about on various expeditions through central Peru with wife Erika Samame, a native of Lima, with whom he has one daughter, Ella Naomi.
​In 2011, while living in Chicago, the brothers began to research Biblical archaeology and the cultures of the Ancient Near East, through which they found the inspiration to begin developing their fiction.
Both brothers now live and write near Greenville, South Carolina.