[4] Having worked at Vredelust Primary School in Bellville for a short while following his graduation, he was appointed a junior lecturer at the University of Port Elizabeth in 1967.
[4] During this time, Troskie studied organ playing and improvisation with Cor Kee in the Netherlands, musicology and organ-building at the University of Amsterdam, and choral conducting under the German conductor Kurt Thomas.
[4] Troskie was appointed lecturer at the University of South Africa in 1971, continuing to develop a career in church music and the study thereof.
[6] The degree Doctor of Music was conferred upon Troskie by the University of South Africa in 1975 on the merits of a thesis entitled "Die koorwerke van Max Reger (1873-1916)".
Serving for eighteen years as the editor of Vir die Musiekleier/To the Director of Music, the official organ of the South African Church and Concert Organists' Society,[8] Troskie published dozens of articles in that journal, frequently writing on new pipe organs around southern Africa and South African church music.
[10] While recognising the importance of Troskie's texts, Erik Dippenaar and Jonathan Hughes both note that the research relies heavily on secondary literature and is thus not always accurate.
As one of three final editors of the Liedboek van die Kerk (2001), and as a major contributor to that publication—providing reharmonisations for many hymns and metrical psalms—Troskie's influence on Dutch Reformed church music in South Africa is keenly felt.