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); and Honorary Chair, Catedrático Extraordinario de Educación Bilingüe, UCAM, Spain (2017).

Instrumental in developing processes for educational transformation, he co-launched Content and Language Integrated Learning (CLIL) under the auspices of the European Commission. He currently works as Director of Innovation & Outreach at ECF (University of Jyväskylä, Finland) on enabling evidence-based solutions to be realized in K-12 and higher education, primarily in Finland, Kazakhstan, Mexico and Vietnam.