He was born in Lake Forest, Illinois, and lived in La Jolla, California, where he worked as an investment counselor.
[1] He was the son of Ezra J. Warner, Jr. and grandson of Ezra J Warner,[2] who were wholesale grocery business executives in Chicago, Illinois.
[3] His father, Ezra J. Warner, Jr., was president & treasurer of wholesale grocery business Sprague, Warner & Company and vice president of the Chicago Orchestral Association.
[citation needed] Ezra J. Warner died in La Jolla on May 30, 1974, and was buried at Lake Forest Cemetery in Illinois.
[4] Ezra J. Warner III is well known for his work in Civil War biography.