|After arriving in Hanover, Hannah never really left. She spent many years building her career at Dartmouth, at a time when the institution did not treat women well. Despite having a Ph.D., Hannah's first job was as a research assistant in the department of Physiology, earning a mere two thousand dollars per year, which even then was not near what a male Ph.D. would be doing or earning. It would take Hannah many years before she was actually in the botany department and even longer before she began teaching. The first course she taught, lab techniques, might not have been Hannah's passion, but she knew the subject matter very well and the students loved her. As a teacher, Hannah was as demanding and thorough as she was innovative and exciting. She inspired hundreds of Dartmouth students to love botany and was a true hero to many of her pupils. She had the patience to pursue a career that seemed to be going nowhere, the talent to command the respect of her colleagues and students, and the true dedication of someone who loved their work, both her algae and her teaching.|
|Dartmouth, however, was not quite ready for a women scientist, even one such as Hannah. The school did not treat Hannah as an equal to her male counterparts. Not until Hannah was fifty-three years old, did the college allow her to teach a course other than lab techniques. From there, Hannah still had to wait another ten years, until 1968, before the College made her a full professor, thirty-three years after Dartmouth hired her. For Hannah's part, she did not hold a grudge against the college or feel any bitterness towards the treatment she received. Hannah was content doing what she loved, recognition was insignificant in comparison. She herself spoke of the "whiny women's libbers." When fellow women academics approached Hannah in the 1960's about "de-marginalizing" women at Dartmouth, she felt they wanted "too much too soon." Hannah was the first woman to make her way through the ranks at Dartmouth. Her climb may have been slow but she remained passionate.|
Hannah retired as a professor Emeritus in 1971, returning to Dartmouth each summer for seven more years to teach. Retiring did not mean the end of her academic pursuits. Hannah continued researching for another twenty years, classifying and making slides of Desmids.