Check out the presenters listed below.
ORACLE ACE DIRECTOR
Alex Nuijten is an independent consultant (allAPEX) specializing in Oracle database development with PL/SQL and Oracle Application Express (APEX).
Besides his consultancy work, Alex conducts training classes, mainly in APEX, SQL, and PL/SQL. Alex has been a speaker at numerous international conferences, such as ODTUG, Oracle Open World, UKOUG, IOUG, OUGF, BGOUG, OGH APEX World, and OBUG. For his presentations, Alex has received several Best Speaker awards.
He has written many articles in Oracle related magazines and at regular intervals he writes about Oracle Application Express and Oracle database development on his blog "Notes on Oracle" (nuijten.blogspot.com). Alex is co-author of the book “Oracle APEX Best Practices” (published by Packt Publishers).
Alex is also co-author of “Real World SQL and PL/SQL” (published by Oracle Press).
Because of his contributions to the Oracle community, Alex was awarded the Oracle ACE Director membership in August 2010.