Katarina Pollock is a co-author of Writing Conversational Korean along with Chelsea Guerra and YuJin Kim. She has been an avid Korean learner since 2018 and lived in Korea in 2019. She has a BA in Statistics and a BA in Marketing from the University of Auckland, NZ. She currently lives in Houston, Tx. Chelsea Guerra is a co-author of Writing Conversational Korean along with Katarina Pollock and YuJin Kim. She has been an avid Korean learner since 2009 when she first studied abroad in Seoul, South Korea. She later lived in Seoul teaching English from 2014 to 2017. She was awarded a BA in Linguistics from the University of Florida in 2013. Originally from Gwangju, YuJin Kim has lived in the United States since 2015. She works as a freelance designer and illustrator in California.