Alex Nuijten works as a database developer and Expertise Lead (database development) for AMIS Services BV in Nieuwegein, The Netherlands. Besides his consultancy work, he conducts training classes, mainly in SQL and PL/SQL. Alex has been a speaker at numerous international conferences, such as ODTUG, Oracle Open World, UKOUG, IOUG, OGh, and OBUG. He is also a frequent contributor at the Oracle Technology Network forum for SQL and PL/SQL. He has written many articles in Oracle-related magazines, and at regular intervals he writes about Oracle database development on the AMIS Technology Blog (technology.amis.nl), as well as on his own blog, Notes on Oracle (nuijten.blogspot.com). In August 2010, Alex was awarded the Oracle ACE Director membership.