Glenn is a multidisciplinarian with a background in geography. Besides being a published author, he also edited "A Patented World? The Privatisation of Life and Knowledge," published by Jacana in South Africa. He currently is on the editorial board of the SA Journal of Natural Medicine.

Additionally, Glenn has written many commentaries and analyses of wide ranging issues including waste management, water use, food security, genetic engineering, nanotechnology, health, agricultural fuels, marine resources, climate and many other environmental and socially relevant issues.

He has also presented many papers and talks to a wide range of audiences. He specialises in communicating complex scientific issues in an accessible manner. He is a freelance writer and researcher.