Annick De Houwer is Professor of Language Acquisition and Multilingualism at the Universität Erfurt, Germany. Her book The Acquisition of Two Languages from Birth (Cambridge, 1990) constituted pioneering work in bilingual acquisition, and her 2009 textbooks Bilingual First Language Acquisition and An Introduction to Bilingual Development are used all over the world.
Lourdes Ortega is Professor of Second Language Acquisition at Georgetown University, Washington DC. A widely published scholar, she is best known for her award-winning meta-analysis of L2 instruction in 2000, her best-seller textbook Understanding Second Language Acquisition (2009, translated into Mandarin in 2016), and for championing a bilingual turn in SLA.