Timothy Dean was a student at Hulton College in 1914. He was often picked on by other students due to his smaller frame. He accidentally found the pod where the Seventh Doctor had stored his biodata while living as the human John Smith.
When the Aubertides came looking for the pod, Dean was able to convince John Smith to become the Doctor again. Afterward, he lived a long life. Though fully human, Dean retained the best parts of the Doctor.
An objector to war, he volunteered to join the Red Cross during World War I. When he was stationed in the Somme in July 1916, he saved the life of Captain Richard Hadleman, whom he recognised from his time at Hulton College.