Leeming's early poems and stories were published in various English journals, including
The London Magazine and
The Guinness Book of Poetry. During his time in London, he participated in poetry discussion group "
The Group" along with fellow Antipodean expat
Peter Porter. Leeming also wrote a number of plays for the stage and for radio. It was described by New Zealand writer
James K. Baxter in 1971 as "masterly", and as "one of the documents to which I turn for reassurance in my private clumsy labours to undo the harm the Catholic Church does to her young". Leeming was the first recipient of the
Katherine Mansfield Menton Fellowship award in 1970. This award allowed Leeming to spend a year in
Menton, France as a writer in residence at the Villa Isola Bella, where
Katherine Mansfield lived from 1919 to 1920. Following his residency, Leeming's first collection of poems,
Venus is Setting, was published in 1972 by
Caxton Press. Its publication was supported by a grant from the New Zealand State Literary Fund. A review in newspaper
The Press preferred Leeming's plays to his poetry, but nevertheless said that some of his poems "achieve a fluidity which reminds one of how well he can write". The review praised in particular "The Priests of Serrabone" and noted it "holds its intensity fairly well and adroitly uses a complex stanza". After time in Africa and Asia as a
Unesco consultant, Leeming settled in France and worked as an
OECD translator. His experiences travelling back to New Zealand with his wife generated his second collection of poems,
Through Your Eyes, published in 2018. In 2021,
Latitudes: New and Selected Poems 1954–2020 was published, containing poems from both his collections as well as previously unpublished works.
Victor Billot, reviewing the collection for
Landfall, described some of the earlier unpublished works as "windows into a vanished world", and said his later poems "develop down strange and wonderful branches". ==Personal life==