She became a part time instructor for the “Department of Zoology in Cambridge” (Goodwin 30). She was one of two women to work there and they were not treated right by the men that worked there. When they went to the department for tea, they would not let her or the other woman sit at the table, Ann had to sit on the first aid kit. She continued her work with Spirostomum as the only female protozoologist on the faculty. She left the protozoology’s position in 1926 so she could go to work for Clifford Dobell at the National Institute for Medical Research, she stayed at this job for three years. Bishop studied parasitic amoebae which is found in the human gastrointestinal, she studied this under Dobell.
Ann got an award of Beit Fellowship in 1929 and was instructed to hold it in the Molteno Institute for Parasitology in Cambridge laboratory, where she would work for the rest of her scientific career. She also worked on the Chemotherapy of Malaria and the parasites, she was made responsible for testing new compounds. “Ann was interested in the drug resistance problem ever since she read the work of Franke and Rohl in Ehrlich’s laboratory of the return of the Century” (Goodwin 34). Ann was assigned three coworkers their names are: Barbara Gilchrist, Betty Birkett, and Elspeth