Upon graduation in 1878, she served for six months as assistant physician under Dr. Eliza Maria Mosher at the Massachusetts Reformatory Prison for Women.

Upon her arrival in Dresden, she knew little German, but after a month's study, she had acquired sufficient knowledge to warrant Dr. Winckel in admitting her to his hospital.

On the completion of study and service abroad, in 1879, and while still in Dresden, she was appointed by Governor Thomas Talbot, on Mosher's recommendation, resident-physician to the Massachusetts Reformatory and returned at once to take up the work.

[1] In 1883, Mosher, being appointed professor of physiology, hygiene and resident physician to Vassar College, asked to have Hall appointed to share the work, the two at this time starting a partnership, beginning their private work in Brooklyn and serving alternately at college.

She was a delegate to the International Congress of Medicine at Paris in 1900, and was frequently appointed by the New York Boards as an expert in medical jurisprudence.

[3] Hall's education began in Vermont, and continued in Milton College, Wisconsin, and in the Dearborn Seminary, Chicago, Illinois, from which she graduated.

[3] Hall worked as a teacher for a few years, but soon after the death of her mother and father, she was persuaded by the family physician to study medicine.

So long as that prison remains a success, so long will the influence of Dr. Hall's early administration and example for good be felt there.After nearly five years of service at the reformatory hospital, she was appointed superintendent by the governor and his council, though she declined the position, as its acceptance would necessitate the giving up of her medical work.

"[8] In the fall of 1887, Hall was appointed central committee delegate to the fourth International Conference of the Red Cross, of Geneva, held in Karlsruhe, Germany.

That conference brought Hall into contact with many noted people of the European courts, where she was reportedly admired widely.

On leaving the country, she was urged by Japanese officials of medical and public education to return and lecture on physiology and hygiene.

It has been of interest to see this side of Japanese high life, and I have enjoyed it very much, but after all the real pleasure has been in getting a hold of these bright-eyed, hungrybrained, vivid and determined young Japanese women, and, more than all these, they are the ones who will give" this sturdy and brilliant nation the final touches needed to bring them up to a full realization of the ideals for which they are reaching and struggling.

Her writings were characterized by a strength of thought, knowledge of her subject and a certain vividness of expression which held the attention of the reader.