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Julien Le Dem is the Chief Architect of Astronomer and Co-Founder of Datakin. He co-created Apache Parquet and is involved in several open source projects including OpenLineage, Marquez (LFAI&Data), Apache Arrow, Apache Iceberg, and others. Previously, he was a senior principal at WeWork, a principal architect at Dremio, a tech lead for Twitter’s data processing tools, where he obtained a two-character Twitter handle (@J_), and a principal engineer and tech lead working on content platforms at Yahoo, where he received his Hadoop initiation. His French accent makes his talks particularly attractive.