Background
Trenwith was born in Auckland.
Trenwith was born in Auckland.
He was educated at Good Shepherd School, Balmoral (primary) and Street Peter"s College, Grafton (secondary). He studied at the University of Auckland and at the Auckland Teachers College (where he obtained Dip TC, Diploma of Teaching in 1978).
He was Principal Lecturer, Advertising, Auckland Institute of Technology. He wrote two comic novels, A50 among the Angels and A50 Revs Up. Trenwith worked as a secondary school teacher at Howick College and other schools before joining the marketing Department of the Auckland Institute of Technology.
He wrote two textbooks on television and newspapers.
At the time of his death, he was enrolled as a Ph. Doctorate student at Auckland University and completed his doctoral thesis a week before he died.
lieutenant was entitled The Politics of Curriculum in Higher Education
In preparing his doctoral thesis, Trenwith became an expert on the history of the Auckland Institute of Technology. His "years of historical sleuthing" made him ""s unofficial historian" and provided the main bulk of the institutution"s centennial publication and for the centennial itself.
Trenwith "gave the institute a precious gift, our history.
He gave his students his knowledge, his wisdom and his heart, and they loved him for lieutenant".