Mary Walker was born in 1848 in Union Springs, Alabama, and was enslaved until she was 15 years old when the Emancipation Proclamation was signed in 1863. She was married and had her first child by the age of 20. She had worked a variety of occupations by the time she was 68, including cooking, cleaning, babysitting, and selling sandwiches to earn funds for her church. Walker and her family then relocated to Chattanooga, Tennessee, In 1917. by the age of 114, she had lost all three of her children as well as her husband.

Walker received a number of medals and accolades for her endurance and determination, including the Key to Chattanooga. She was also designated Chattanooga’s Ambassador of Goodwill twice and was certified as the Nation’s Oldest Student by the U.S. Department of Health, Education, and Welfare.