Sara Davila is a Pearson Global Scale of English Ambassador and English-language specialist with expertise in language education, curriculum innovation, and educational technology. A former classroom teacher, she has designed and delivered hands-on GSE training programs for teachers worldwide, enabling them to monitor student progress with confidence. Sara has led national development initiatives in multiple countries, equipping instructors with actionable insights and proven strategies to tailor instruction and streamline planning. Based in Chicago and partnering globally, Sara is passionate about empowering educators and students to achieve their goals.

Billie Jago is a writer and teacher trainer specialising in digital learning materials and assessment resources. She is also the GSE ambassador for the UK. She has written for a number of well-known English Language learning titles and is a regular item writer for high stakes exams such as the PTE, IELTS and Cambridge exams. Alongside materials writing, she delivers international teacher training sessions, plenaries and workshops, and is the founder of the ELTcpd professional development platform and YouTube channel. She currently lives in Edinburgh, Scotland.

Mike Mayor is a specialist in language measurement and learning frameworks. As Academic Lead for the Global Scale of English, he supports teachers and institutions worldwide in understanding learner progress and building confidence through meaningful, data-informed assessment.

David Booth is the Director of Test Development in Pearson’s English Language Learning division. He is responsible for the development of test content for a range of language tests. He was responsible for integrating the Global Scale of English into Pearson tests and has also been instrumental in developing the Global Scale of Languages, an extension of the GSE.

Agata Wisniewska is a Learning Scientist and Senior Global Scale of English Developer at Pearson, with over 14 years of experience in educational publishing. She specializes in developing ELT courseware, managing editorial teams and serving as a subject matter expert on the Global Scale of English and the Global Scale of Languages. Agata holds a B.A. and M.A. in English, as well as a CELTA qualification, and has taught English to children, adults and university students. Her professional passion lies in linguistics and language learning, driving her commitment to advancing innovative tools and resources for learners worldwide.