Marc Alt is the Executive Director of the Green Parking Council, a nonprofit organization launched in 2010 that examines the sustainable future of parking. The organization’s influence spans the concepts of green building, clean technology, renewable energy, smart grid, urban planning and sustainability. Marc Alt is the Executive Director of the Green Parking Council, a nonprofit organization launched in 2010 that examines the sustainable future of parking. The organization’s influence spans the concepts of green building, clean technology, renewable energy, smart grid, urban planning and sustainability.