Oracle ACE speakers

15 Oracle ACEs participate in this years HrOUG conference. Oracle ACEs are among the best Oracle conference speakers recognised by Oracle community.


Roel Hartman

Roel is a experienced Oracle Software Architect. He started a long time ago using Oracle RDBMS 5, Oracle Forms 2.3, RPT/RPF and Oracle*Case 4.5. Since a few years he focuses mainly on Oracle Application Express.Roel has been a speaker on UKOUG, OOW, Collaborate, ODTUG's KSCOPE and a number of local Oracle User Groups. He acts as the APEX Content Lead for the Kscope14 and KScope15 conferences and keeps an (APEX-related) blog on In June 2009 Roel received an Oracle ACE award and in August 2010 he's appointed as Oracle ACE Director. Roel is a co-writer of the "Expert Oracle Application Express" and "Oracle Application Express for Mobile Web Applications" books.Roel is Director at APEX Consulting in The Netherlands.


Osama Mustafa

Osama Mustafa is Founder of Gurus Solutions Company, Oracle ACE Director , Creator/Director of Jordan Amman Oracle User Group the first Group in Jordan related to oracle technology,Author of the book Oracle Penetration Testing, Osama has been working on project and customer support in EMEA Region, Providing Database Implementation Solutions, his specialties Fusion middleware, In memory database Timesten, Exalytics and Exalogic machine, Include to this Osama Is frequently Speaker in Oracle User Groups around the world and one of RAC ATTACK event organizer, Fusion middleware ATTACK Organizer as well, he published articles in Oracle Magazine, OTECH magazine and UKOUG Oracle Scene magazine, ....


Alex Nuijten

Alex Nuijten works as a key consultant for Ordina Oracle Solutions in The Netherlands. Besides his consultancy work, he 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 and OBUG. He wrote 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" ( Alex is co-author of the book “Oracle APEX Best Practices” (published by Packt Publishers).


Peter Raganitsch,

Peter Raganitsch, co-founder and CEO of FOEX GmbH in Austria, has more than 20 years of experience in Oracle DB, Forms, and APEX. Always looking for ways to make things better and develop new solutions, he shares his knowledge and solutions with the community in the form of the ApexLib Framework, several tools, blogs, webinars, and cutting-edge things such as the first mobile theme for APEX. Peter is also an Oracle ACE Director.


Deneš Kubiček 

Denes is a well-known lecturer, blogger and author in Oracle APEX area of expertise. He is an Oracle ACE Director and also working as a consultant, managing projects of BI/Cubes Opal Consulting company. He was born in Croatia, but has been living and working in Germany and Canada for almost 20 years. He won the "Oracle Application Express Developer of year 2008". He is strongly supporting Oracle user group activities.


Christian Antognini

Since 1995, Christian Antognini has focused on understanding how the Oracle database engine works. His main interests include logical and physical database design, the integration of databases with Java applications, the query optimizer and basically everything else related to application performance management. He is currently working as a senior principal consultant and trainer at Trivadis in Zürich, Switzerland.He is a proud member of the OakTable Network and an Oracle ACE Director. Christian is the author of Troubleshooting Oracle Performance (Apress, 2008/2014) and the co-author of Der Oracle DBA (Hanser, 2011).


Joze Senegačnik 

Joze has more than 25 years of experience with Oracle products. He started in 1988 with Oracle DB version 4. He is an internationally known speaker and a member of prestige Oak Table. He is an Oracle ACE Director year-long contribution to Oracle community. Joze is a HrOUG traditional speaker, always contributing with relevant topics.


Heli Helskyaho

Heli Helskyaho holds a Master's degree (Computer Science) in Helsinki University and she is specialized on databases. Heli is also an Oracle ACE Director and a frequent speaker in many conferences. She has been working on IT since 1990 and with Oracle products since 1993. She has been in several positions but every role has always included database design. Heli has been an Oracle Designer user since 1996 and a Data Modeler user since 2010. She is also the CEO for Miracle Finland Oy. Heli believes that good database design and good documentation reduces performance problems and makes solving them easier. Heli is the author of Oracle SQL Developer Data Modeler for Database Design Mastery (Oracle Press 2015).

  Zoran Jovanović has been working as a consultant and a Oracle based system architect for over 25 years. He is certified DBA specialist. He is an Oracle ACE and an experienced lecturer on various conferences.
  Piet de Visser is an experienced consultant for databases and administration. He is always combining technical expertise with vast experience from global organizations and is using it on international projects. He is a certified DBA specialist. Višestruko je certificiran DBA specijalista. He is an Oracle ACE and an experienced lecturer on various conferences.

Ami Aharonovich

Ami Aharonovich, Brillix-DBAces CEO, President of ilOUG (Israel Oracle User Group), Oracle ACE and OCP (Oracle Certified Professional), head of Oracle department at John Bryce Hi-Tech College, an Oracle University education center. Ami is an Oracle ACE and Oracle certified professional DBA with over fifteen years of expertise as an Oracle DBA consultant and instructor, specializing in Oracle database core technologies.

  Zoran Pavlović is a DBA specialist with a few certifications. He is working at Parallel as a technical architect. He is an instructor on numerous Oracle courses for Oracle University in the EMEA region. He is a regular OUG conferences lecturer. Zoran is a member of Oracle ACE Program and a Oracle ACE associate.

Jan Karremans 

Jan started his IT career in a medical facility of the Royal Dutch Army in 1992 as an administrator on a Datapoint Mainframe. In 1994 the medical facility switched to using Oracle 7.1 on a Micro VAX 3100, which kicked of his career in Oracle. From 1998 Jan supported the development of a system for health-care administration. In 2011 he started working as a Business Development Manager for Dbvisit. Most recently Jan joined Austrian based FOEX, a company specializing in enhancing Oracle Application Express to meet data intense implementations.


Maja Veselica is a certified DBA specialist. She is working at Parallel as a consultant. She is an instructor on many Oracle courses and a regular OUG conferences lecturer. Maja is a member of Oracle ACE Program and a Oracle ACE associate.



Philippe Fierens

Philippe is an independent Oracle DBA and architect and Oracle Ace Associate and a regular speaker at Oracle Usergroup conferences. As a consultant he helps his clients to find efficient, cost efficient, performing and creative solutions, he likes to think with the client. The last 5 years he has been involved in various projects using SPARC technology : move M9000 to T5 and LDOMs and this year a move from M9000 to Sparc Supercluster, he is also interested in everything what happens in the SE area, it offers a great value and lots of opportunities.

The conference is organized by the Croatian Association of Oracle users. More about the association can be found at

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