Jonah Ptak
- (2017): Grayston Pedestrian Bridge: A Shared Perspective of South Africa’s Connectivity and the Challenges of Getting There. Présenté pendant: IABSE Symposium: Engineering the Future, Vancouver, Canada, 21-23 September 2017.
- (2011): Context-Sensitive Solutions in Community Development Projects. Présenté pendant: 4th International Conference Footbridge 2011, Wroclaw, Poland, 6-8 July 2011.
- (2014): The Future of Footbridge Engineering and Aesthetics as Presented by Science Fiction and Fantasy Films. Présenté pendant: Footbridge 2014 - Past, Present & Future, London, 16-18 July 2014.
- (2014): Model Kloof Pedestrian Bridge and Walkway: The First Greenroads SA Pilot Project. Présenté pendant: Footbridge 2014 - Past, Present & Future, London, 16-18 July 2014.