Ruth Wajnryb is a professional teacher trainer and materials writer. She has an MA in Applied Linguistics from Sydney University with research in the area of error analysis and language-learner language. She has worked as the Director of teacher training and professional development at a number of institutes and colleges in Sydney. She has over twenty years of experience in the field of adult education in Australia, England, Israel and South America.

She has written Grammar Dictation for Oxford University Press.