In this episode, we interview Mariana Casals, an English teacher, proofreader and materials writer based in Rio. A Celta holder and frantic course taker, she has more than 15 years work experience at age 32.We chat about the work of copy editing in ELT, the changes in course design and materials, especially those that are here to stay, and where the area is heading. Mariana can be found online at @teachercasals on Instagram and Facebook.