Chris Saxon is the quizmaster for the Database Design competitions and an Oracle Developer Advocate for SQL. His job is to help you get the best out of the Oracle Database and have fun with SQL! He's also part of the answer team on Ask TOM and creates YouTube videos at The Magic of SQL channel.

Hans Viehmann works for Oracle as Product Manager for spatial and graph technologies on both the Database and Big Data platforms. He holds a degree in Physics from Hamburg University and started his career in Research before joining Oracle over twenty-five years ago. After various positions in Presales and Business Development, he joined the Product Management Team in 2011. He is responsible for the outbound product managers on the Oracle spatial and graph team. With his team, he looks after strategic projects and partnerships, marketing activities, as well as internal awareness around Oracle's spatial and graph technologies worldwide. He works closely with various Oracle User Groups and helped establish Spatial and Graph Special Interest Groups in several countries. He is a regular speaker at conferences and user group events and serves on the advisory board of InGeoForum, Germany.