Haller, born South African, was educated at the Grey Schools in Gqeberha. This was followed by a six-year sojourn in the British South Africa Police in the then Rhodesia, during which he served some time as a public prosecutor. He then bicycled throughout all the countries of the British Isles before settling down to business back in South Africa. He became a passionate motorcyclist, undertaking many long-distance tours through the countries of Southern Africa. He turned to full-time writing in January of 2020.