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 a few others. Previously, he held senior roles at Wework, Dremio, Twitter where he also obtained a two-character Twitter handle (@J_) and Yahoo, where he received his Hadoop initiation. His French accent makes his talks particularly attractive.