A prolific Theosophical writer and lecturer. Codd was born on October 10, 1876, at Barnstaple in North Devon, England. She joined the Theosophical Society on December 16, 1903, and was General Secretary of the Australian Section in 1934-36. She also served as General Secretary of the TS in South Africa in 1938. In 1906 she was appointed first National Lecturer of the English Section and in 1922 became an official International Lecturer. Codd was an energetic campaigner for women's rights and suffered imprisonment during the time of the English suffrage movement. She was Chief Link in the Golden Chain, a Theosophical movement mainly for children. Codd died in England on April 3, 1971.

Publications include The Ageless Wisdom of Life (1957), Introduction to Patanjali’s Yoga (1966), Masters and Disciples (1928), Meditation: Its Practice and Results (1930), The Mystery of Life (1963), So Rich a Life (1951), The Technique of the Spiritual Life (1958), Theosophy As the Masters See It (1953), Theosophy for Little Children (1930), Trust Yourself to Life (1975), and The Way of the Disciple (1964).