After completing his MRes in 1996 Derren worked in the minerals and waste sector initially focusing on recycling a range of mineral wastes as a civil engineering material, and then developing and managing projects to minimise and mitigate the environmental impacts of mineral extraction. During this time Derren volunteered for community organisations and social enterprises in practical and governance roles. After a return to academia, a brief period as a teacher and working for the Environment Agency, Derren embarked on his doctoral research in geology and submitted his PhD thesis in July 2018.
Derren now works full-time on the Encompass project and is developing an environmental based community organising approach in conjunction with Citizen’s UK. This work includes a range topics including clean air, plastics pollution and urban green space.