Richardson returned to medicine after leaving politics, specialising in high-risk obstetrics and gynaecology and later in assisted reproductive technology. He held consultant and teaching appointments at Fremantle Hospital from 1986 to 1991. He later served as chairman of the National Association of Specialist Obstetricians and Gynaecologists (1991–1995) and national president of the Australian Association of Ambulatory Vaginal and Incontinence Surgeons (1995–2000). In 2010, Richardson joined Central Queensland University as an adjunct professor in the School of Medical and Applied Sciences.
