Hans Mol worked as a teacher, teacher trainer, director of studies, producer, project coordinator, editor and author in and for countries such as Holland, Germany, Switzerland, Italy, United Kingdom, Hong Kong, Mexico, Brazil, Japan, Indonesia and Australia. He was joint coordinator of the Young Learners and Teenagers Special Interest Group for IATEFL (International Association for Teachers of English as a Foreign Language). He wrote many course books and resources for young learners, teens, young adults and adults published globally and regionally. He also produced ELT songs through supasongs.com. For Garnet Education, he wrote Tourism and Hospitality in the ESAP series, and co-authored Business English course, Business Update.