David Marsh has an extensive track record in the European Union, which complements work carried out in Africa (Ethiopia, Mozambique, Namibia, South Africa), East Asia (Japan, Korea), Iceland, India, Kazakhstan, Kosovo, Middle East (KSA, UAE, Qatar), Russia, Southeast Asia (Brunei, Hong Kong, Laos, Malaysia, Thailand, Philippines, Vietnam), North America, (Mexico, USA), and South America (Argentina, Colombia, Peru).

His work is recognized through awards and nominations including the English-speaking Union (2008), Estonian Educational Sciences (2009), Doctor honoris causa at Valencian International University (2013), International Academic Board of the Inter-University Institute for Quality Practice (2016); Honorary Chair, Catedrático Extraordinario de Educación Bilingüe, UCAM, Spain (2017), and Fellow, Royal Society of Arts, London (2019).

Having co-launched Content and Language Integrated Learning (CLIL) in Europe, his recent work on transforming education has involved implementing strategic plans, designing blueprints for international schools, and creating professional development programmes. A special focus of interest is the impact of languages on the mind and brain, bilingual education, and adjusting teaching and learning practices to accommodate the needs of digitally astute young people. He is currently Director, Innovation & Outreach, EduCluster Finland, University of Jyväskylä Group, Finland.