Heikki Tuuri is the creator of InnoDB, the transactional storage engine that became the default engine of MySQL. He founded Innobase Oy in Helsinki in 1995 to develop it, and after InnoDB was released under an open source license, MySQL began shipping it in 2001. InnoDB brought ACID transactions, row-level locking, crash recovery, and foreign keys to MySQL. Oracle acquired Innobase in 2005, and Tuuri continued to lead InnoDB development there.
Heikki Tuuri
Creator of the InnoDB storage engine and founder of Innobase Oy.