Doug Bierer wrote his first program on a Digital Equipment Corporation PDP-8 in 1971. Since that time, he's written buckets of code in lots of different programming languages, including BASIC, C, Assembler, PL/I, FORTRAN, Prolog, FORTH, Java, PHP, Perl, and Python. He did networking for 10 years. The largest network he worked on was based in Brussels and had 35,000 nodes. Doug is certified in PHP 5.1, 5.3, 5.5, and 7.1, and Zend Framework 1 and 2. He has authored a bunch of books and videos for O'Reilly/Packt Publishing on PHP, security, and MongoDB. His most current authoring project is a book called Learn MongoDB 4.0, scheduled to be published by Packt Publishing  in September 2019. He founded unlikelysource(dot)com in April 2008.

Sumit Sengupta has worked on several RDBMS and NoSQL databases, such as Oracle, SQL Server, Postgres, MongoDB, and Cassandra. A former employee of MongoDB, he has designed, architected, and managed many distributed and big data solutions, both on-premise and on AWS and Azure. Currently, he works on the Azure Data and AI Platform for Microsoft, helping partners to create innovative solutions based on data.