Juan Claudio S. Castro or "JC" is an English-grammar enthusiast and a passionate writer. He keenly studies the grammar of English, and shares the knowledge acquired and his insights on different grammatical topics through feature articles and social media posts. He has numerous write-ups published both online and in print. He holds a master's degree in English language studies.

For his professional background, JC has significant experience in news and social media writing. He wrote press releases about the Philippine government's budgetary allocations to its agencies and for specific  national programs. He also crafted sundry social media captions about the national budget and Philippine economy, posted on Facebook, Instagram, and YouTube. Moreover, JC conducted various media coverages both as a writer and photographer, publicizing different national events.

Presently, JC works as the head of news monitoring section of a national government agency in the Philippines.