Zell Bryan Miller (February 24, 1932 - March 23, 2018) was an American author and politician from the U.S. state of Georgia. A Democrat, Miller served as lieutenant governor from 1975 to 1991, 79th Governor of Georgia from 1991 to 1999, and as U.S. Senator from 2000 to 2005. Miller was a conservative Democrat. In 2004, he supported Republican President George W. Bush against the Democratic nominee John Kerry in the presidential election.

Miller was born in the small mountain town of Young Harris, Georgia. His father, Stephen Grady Miller (1891-1932), was a teacher who died of cerebral meningitis when Miller was a 17-day-old infant, and the future politician was raised by his widowed mother, Birdie Bryan (1893-1980). He had an elder sister, Jane, who was six years older than he. As a child, Miller lived both in Young Harris and Atlanta. Miller received an associate degree from Young Harris College in his home town and later attended Emory University.  Less than a month after the Korean War armistice, Miller wound up in a drunk tank in the mountains of North Georgia. Miller stated later that this incident was the lowest point of his life. Upon his release, Miller enlisted in the Marines. During his three years in the United States Marine Corps, Miller attained the rank of sergeant. He often referred to the value of his experience in the Marine Corps in his writing and stump speeches. In his book on the subject, entitled Corps Values: Everything You Need to Know I Learned in the Marines, he wrote:  In the twelve weeks of hell and transformation that were Marine Corps boot camp, I learned the values of achieving a successful life that have guided and sustained me on the course which, although sometimes checkered and detoured, I have followed ever since.  After serving in the Marines, Miller enrolled in 1956 and earned bachelor's and master's degrees in history from the University of Georgia. He taught history at Young Harris College following his graduation from the University of Georgia.

Using a quote from the above article, answer the following question: Who was his mother?
Birdie Bryan (1893-1980