Oracle ACE Program

Community Thought Leaders

Our flagship advocacy program recognizes Oracle evangelists and enthusiasts. It’s both a network and a resource to help you meet today’s IT challenges.

Oracle Community Experts and Advocates

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  • 500+

    Technical experts and evangelists are active in this global network.

  • A Proven Oracle Expert

    Recognized for their technical expertise, Oracle ACEs contribute knowledge with articles, technical advice, blog posts, and tweets. Join the community and learn from their insights and experience.

  • A Three-Level Program

    The Oracle ACE program supports community advocates at each stage of their careers. All you need is a willingness to share your knowledge with peers.

  • ACE Directory

    Oracle ACEs are working in over 55 countries around the world. Search by name, location, expertise, and level to view their profiles.

  • What is an ACE?
  • ACE Levels
  • Find an ACE
Ace spotlight icon Oracle ACE Spotlight

Roel Hartman, Oracle ACE Director Ace Director spotlight icon

Director, APEX Consulting (Netherlands)
Director, ODTUG Board of Directors
Member of SMART4APEX Cooperation

Roel Hartman has a lengthy history of working with various Oracle technologies and is a world-renowned expert in Oracle Application Express. In June 2009, Hartman was awarded the Oracle ACE award and in August 2010, based on his sharing of knowledge and continued contributions to the community, he was promoted to Oracle ACE Director.

Hartman contributes to the technology community in various ways. He presents at several international conferences including Oracle OpenWorld, DOAG, UKOUG, Collaborate, ODTUG’s Kscope, and is a frequent speaker at several Oracle User Groups events throughout Europe. He is a coauthor of two books, Expert Oracle Application Express and Oracle Application Express for Mobile Web Applications. He has an APEX-related blog, , and distributes APEXpress Weekly, an online newsletter containing recent news regarding Oracle Application Express. You can also follow Hartman on Twitter @RoelH.

In addition to his technical contributions, Hartman gives back to the community through volunteerism. He was the APEX Content Lead for ODTUG’s Kscope 14 and Kscope 15 conferences, served on the ODTUG Board of Directors in 2016, and was re-elected to a two-year term starting January 2018.

Hartman lives in a small village close to Deventer, one of the oldest cities in the Netherlands, with his wife and two daughters. In his spare time, Hartman likes to run races solo or with his family. He completed three marathons in one year and has plans to complete two more, including the 2018 New York City Marathon.

Oracle ACE Levels

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