Marcus led the Northbrook Park water restoration project in Lewisham, taking it from concept to delivery. Using hydrological data, he identified opportunities to daylight a lost river and designed new wetlands and a meandering stream to enhance biodiversity, improve flood resilience, and connect green spaces within the Grove Park Regional Park vision. Working with Lewisham Council, Network Rail, and community partners, he secured multi-agency funding and oversaw construction as principal designer. The completed scheme has created thriving wetland and woodland habitats, improved water quality, and strengthened community engagement with nature.