Justyna Winiarczyk is a Polish translator and educator with a background in Applied Linguistics who began raising her son bilingually before his second birthday — a year later, he was fluent in both Polish and English. Known online as English Speaking Mum, she has spent over five years helping hundreds of Polish families implement intentional bilingualism at home using her natural immersion method. She has sold over 10,000 ebooks, published more than 180 blog posts, and authored the book Twoje dziecko moze mowic takze po angielsku (Your Child Can Speak English Too). Winiarczyk runs online courses for both parents and preschool teachers, and hosts a Polish-language podcast and YouTube channel on raising bilingual children. Her platform has become the primary Polish-language resource for families who want their children to grow up fluent in English without formal classroom instruction.