In 1962, Callingham began working for the
New Zealand Broadcasting Corporation in radio advertising, and in 1963 she became a journalist at the
New Zealand Listener. She worked in journalism for television, radio and magazines for the next ten years, including reporting for the television shows
Montage and
Town and Around, time presenting weather forecasts, and three years spent as a journalism tutor at
Wellington Polytechnic. In 1974, she began writing television drama. In 1982, she wrote the television drama
Casualties of Peace, inspired by her father's experience, which was nominated for best script at the
New Zealand Feltex Awards. She worked on a range of other television shows during the 1990s, including notably for the sitcom version of
The Billy T James Show, and received award nominations for the shows
Duggan and
Marlin Bay.
Duggan actress
Katie Wolfe described Callingham as having great empathy and understanding of female characters, ==Media work==