World Architecture top 100 firm Harley Ellis Devereaux are celebrating after turning 100 on Saturday. Harley Ellis Devereaux has enjoyed a successful practice since 1908,working in all facets of architecture, from planning and design to construction. Today, they are a firm of more than 500 people in 7 offices with expanded capabilities, through their partner companies, in strategic planning, program management, real estate services, sustainable design, quality review and construction services.