In 1919, Jarrett became the associate director of a new graduate program at Smith College, which focused on psychiatric social work. This was the first session of the Smith College Training School of Psychiatric Social Work, which became the Smith College School for Social Work. Its immediate success led the Board of Trustees to make it a permanent program, and in 1919 Stuart Chapin was appointed Director. Jarrett was named Associate Director, and served in that capacity until 1923. During this time she was able to write and publish the book The Mental Hygiene of Industry, which emphasised how mental health has an impact on productivity.
