After graduating Fitz-Gibbon trained as a teacher, and began teaching physics in East London.
"[7] Fitz-Gibbon returned to the United Kingdom in 1976, where she was appointed a lecturer at the University of Manchester Institute of Science and Technology.
[8][9][10] In 1983 she launched the A-Level Information System (Alis) an adapted assessment that supports students as they work for their GCE Advanced Level exams.
[11] She developed two additional information systems (MidYIS and Yellis), which supported teachers in collecting and analysing student data.
She spent her much of her life after the diagnosis campaigning locally and online to raise awareness of the link between pesticides and Parkinson's, in an effort to save others from a similar fate.
Her daughter, Sorel Fitz-Gibbon, is a researcher in bioinformatics and comparative genomics at University of California, Los Angeles.