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 Bill Karwin has been a software engineer for over thirty years, developing and supporting applications, libraries, and servers, and consulting for leading technology companies. Throughout his career he has shared his knowledge to help other programmers succeed. He has answered thousands of questions, which gives him a perspective on the SQL mistakes that most commonly cause problems.
 
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 Daniel Nichter is a DBA and software engineer who started optimizing MySQL performance in 2004 and soon created [hackmysql.com](https://hackmysql.com/) to share information and tools about MySQL. He spent eight years at Percona working on [Percona Toolkit](/resources/software/percona-toolkit/), and worked on Percona Monitoring and Management during his final year there. His earlier tools, among them mysqlreport, mysqlsla, and mysqlsniffer, were for several years a de facto standard. The O'Reilly author note also lists him as a MySQL Community Award winner and conference speaker.
 
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 Daniël van Eeden works on a range of MySQL-related projects and writes about databases on his blog. He created the [MySQL History Graph](/resources/books/mysql-history-graph/), a set of diagrams of MySQL's version history and its forks, generated with GraphViz and open to edits and pull requests on GitHub.
 
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 David (Dave) Stokes is a Community Manager at [DBeaver](/resources/software/dbeaver/) and a recognized expert in open source databases. He is the author of [*MySQL and JSON: A Practical Programming Guide*](/resources/books/mysql-and-json/) (McGraw-Hill, 2018), a step-by-step guide to using JSON with MySQL that covers the MySQL Document Store and GeoJSON. He spoke at devopsdays Dallas 2025.
 
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 Jay Pipes is the co-author, with Michael Kruckenberg, of [*Pro MySQL*](/resources/books/pro-mysql/) (Apress, 2005). At the time of the book he was the North American community relations manager at MySQL. He had written articles for Linux Magazine and regularly helped software developers make effective use of MySQL, and he had given sessions on performance tuning at the MySQL Users Conference, RedHat Summit, NY PHP Conference, OSCON, and Ohio LinuxFest, among others.