Dr Phoebe Siu serves as a lecturer at the College of Professional and Continuing Education (CPCE) of The Hong Kong Polytechnic University. Dr Siu earned her doctoral degree in English Language Education from The University of Hong Kong, where her thesis focused on heteroglossic co-becoming approaches to Content and Language Integrated Learning (CLIL) for Public Relations Writing in English-as-the medium of instruction (EMI) higher education.

Dr Siu possesses a multidisciplinary academic background, including a Bachelor of Arts in English (first-class honour), a Master of Philosophy (MPhil) with an emphasis on post-colonial literature, a Master of Social Sciences (M.S.Sc.) in Corporate Communication and a Master of Education (MEd) specialising in Language across the Curriculum. Her MEd dissertation concentrated on English for Academic Purposes (EAP) classrooms tailored for Healthcare and Nursing students in Hong Kong.

Since 2015, Dr Siu has actively contributed to both local and international research grants and funded projects encompassing dynamic assessment, artificial intelligence in education, multimodal teaching strategies, translanguaging, critical semiotic awareness, and systemic functional linguistics within EMI and CLIL contexts. She has presented her work at numerous prestigious academic conferences such as the EMI Symposium, LSPPC, ISFC, AAAL, AERA, AILA, SSLW, J-CLIL, World-CLIL, and Asia TEFL.

Dr Siu maintains international membership in distinguished academic organisations across the United States, Europe, and Asia, including AILA, AAAL, J-CLIL, AERA-SIG110, ESERA-SIG 6, and CPCE-RIG for Multimodal Learning and Pedagogies, among others. Since 2019, she has been a member of the Translanguaging-Trans-semiotizing Research Group founded by Prof. Angel M. Y. Lin, facilitating global collaboration through digital platforms and international research and publication initiatives. Dr Siu has been recently invited to develop the PAA-4T model led by Prof. Lin as a core researcher, contributing to AI-enabled tertiary education and professional teacher development, emphasising plurilingualism, affect, and agency (PAA) built upon the lenses of translanguaging, trans-semiotizing, transknowledging and transculturing (4T).

Her scholarly publications include refereed conference proceedings, journal articles, and book chapters on translanguaging, creativity, EMI, and CLIL with a focus on educational contexts in Hong Kong and Asia. Additionally, Dr Siu is an invited reviewer for esteemed academic journals, including Cogent Education, The Australian Review of Applied Linguistics, Critical Inquiry in Language Studies, and International Journal of Bilingualism and Education.