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Yann Collet is a French software engineer known for his work on data compression algorithms and software. He is the creator of several influential open-source projects, including Zstandard (also known as zstd), LZ4 , xxHash , and FSE (Finite_State_Entropy). Collet's work focuses on improving the speed, efficiency, and performance of data compression and hashing algorithms, which are widely used in various applications, including file systems, databases, and networking.

Education and career
Yann Collet graduated with a master's degree in Computer Science from the École Nationale Supérieure des Télécommunications de Bretagne (ENSTBr) in France. Prior to joining Facebook in 2015, he held non-programming positions in marketing and project at various telecommunication companies, such as Orange, Ericsson, and Thales, while practicing programming overtime as a hobby. At Facebook, Collet transitioned to a full-time software engineering role, where he developed the Zstandard compression algorithm, and continues to contribute to and maintain his open-source projects.

Notable projects

 * Zstandard: Zstandard, or zstd, is a lossless data compression algorithm that provides fast compression and decompression speeds while maintaining a high compression ratio. It has been adopted by various software, storage systems, and data transfer protocols, such as BtrFS in the Linux kernel, the Hadoop Distributed File System (HDFS), or RocksDB.
 * LZ4: LZ4 is a lossless data compression algorithm designed for high-speed compression and decompression with a focus on low latency. It is widely used in applications that require real-time processing, such as multimedia streaming and gaming. For example, it's the default compression method used by the Unity Game Engine.
 * xxHash: xxHash is a non-cryptographic hash function designed for speed and efficiency. It is used in applications that require fast hashing, such as databases and data deduplication systems.
 * FSE: Finite_State_Entropy (FSE) is a data compression technique that uses a finite state machine to encode and decode data at high speed. It is based on ANS theory from Jarek Duda. FSE has been integrated into Zstandard and LZFSE to improve compression efficiency.

Recognition and impact
Yann Collet's work on data compression and hashing algorithms has been widely recognized for its contributions to the field. His algorithms are used in various industries, including telecommunications, data storage, and multimedia streaming, due to their high performance and efficiency. Collet actively participates in the open-source community, contributing to and maintaining his projects, which have been adopted by numerous other projects and organizations, such as Apache Hadoop, Linux, and the IETF.