[2][1] Following her graduation, Mittelheuser completed a PhD in Biological Sciences in 1971 before working in the university's botany department where she was a senior research fellow from 1971 until 1976 and acting lecturer in third year cell physiology in 1975 and 1976.
[1][2] Mittelheuser is also known for her involvement with the Lyceum Club where she served three consecutive terms as president from 1989 to 1992.
[5] In 2001, Mittelheuser was awarded the Centenary Medal for distinguished service to both the Arts and the Lyceum Club.
[6] From 18 July 2020 until 31 January 2021, the Queensland Art Gallery held an exhibition called "Two sisters: A singular vision" showcasing over 100 works that the Mittelheuser sisters had acquired for the gallery over a 35 year period, particularly works by female Indigenous Australian artists.
[7] Mittelheuser is also the benefactor behind the Mittelheuser Scholar-in-Residence at the State Library of Queensland, a research project which aims to advance the knowledge of professionals in the gallery, library, art and museum fields by awarding a $15,000 bursary each year to a successful applicant.