Thomas Hubbard was born in Ashtabula, Ohio, on July 11, 1859.[Toledo Biographical Scrapbook. (Hols-Hubb) Local History Room. Toledo Lucas County Public Library]. Thomas Hubbard entered the Western Reserve University Preparatory School in 1879. In 1880 he became a student at the University of Michigan.[Killits, John. Toledo and Lucas County, Ohio: 1623-1923. 3 Vols. (Chicago: S.J. Clarke Publishing Co., 1923). p.660]. He graduated in 1882 with a Ph.D and, inspired by the example of his uncle, Dr. John C. Hubbard, attended medical school at Western Reserve Medical College from 1882 to 1883.(Toledo Biographical Scrapbook)
In 1883 he continued his studies at the medical department of the University of Pennsylvania. Two years later he graduated with a medical degree. Hubbard then opened a practice in Ashtabula. In 1887 he was given the opportunity to study for six months at the University of Vienna, Austria. When he returned in 1888, he set up an ear, nose and throat practice in Toledo.
Hubbard was a pioneer using new medical discoveries soon after their discovery. This included intubation for membranous croup and the first use of the diptheria antitoxin in Toledo. After he left private practice he worked at several different hospitals. During his life he worked at the Toledo Hospital, St. Vincent's Hospital, Robinwood Hospital and Flower Hospital. Hubbard was a member of the American and Ohio State Medical Associations and served as President of the American Laryngological Association in 1913.(Killits, pp. 660-61).
He married Charissa Braves on September 4, 1889. He was also involved with the Adams Street Mission and a member of the Trinity Church.