A professional planner for over thirty-five years, Margaret McDowall-Thompson co-edited the National Physical Development Plan, created the National Housing Land Bank, participated in squatter regularisation, housing assistance programmes, urban redevelopment, vendor and maxi-taxi regularisation, planning and implementation of health, national security, community and commercial buildings in Trinidad and St. Lucia and municipal investment plans. She is a past General Manager of NIPDEC, executive member of the Citizens for Conservation and ICOMOS TT, a member of the Trinidad and Tobago Society of Planners and the Caribbean Planners Association. She is the past Chairman of the National Trust of Trinidad and Tobago.Â