Gideon has been working as a senior project leader-researcher at the Faculty of Engineering and the Centre of Expertise City Net Zero of the Amsterdam University of Applied Sciences (AUAS) since 2016. He has collaborated with the municipality of Amsterdam to develop an integrated physical-social approach for the 32 deprived neighbourhoods (Ontwikkelbuurten) and led the EU project called Cool Towns (featured in the books Urban Heat Atlas + Cool Towns Intervention Catalogue). Currently, Gideon is a member of the chair of Spatial Urban Transformation and the senior project leader-researcher of Building4Wellbeing at AUAS (featured in the book Neuroarchitecture). In this project, Gideon is leading a team of researchers and a consortium of architecture and urban planning firms to investigate how housing can strengthen well-being. 

Gideon is also a professor of Innovation & Green Urban Space at Aeres University of Applied Sciences. His chair focuses on the value of urban green spaces and divides them into three main areas: rewilding cities, biobased buildings, and climate-resilient strategies. This research has been reflected and operationalised through various projects such as Biodiverse Cities (EU-Interreg funded), Nature Inclusive Area Development, Green Blue City (both financed by Sia and Ministry of LNV) and Excellent Green Healthy Living Environment (locally funded).  His research aims to redesign the built environment through ecosystemic thinking, biometric technology, neuro-architecture principles, and ecosystem services assessments. The goal is to better understand how we can restore biodiversity and improve human health and well-being in a changing climate.