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Members

Timur Akhmadeev

Timur Akhmadeev

Georgia
databases, middleware, performance, optimization, troubleshooting

Timur is an Oracle Apps Database Consultant at Pythian.

Liron Amitzi

Liron Amitzi

Chris Antognini

Chris Antognini

Switzerland

Christian Antognini is a strong believer that at the core it is all about the data, and on how effectively companies process and take advantage of it. For that reason, since 1995 he has focused on the efficient use of database engines. His main interests include logical and physical database design, query optimizers, and basically everything else related to data processing and application performance management.

Mirela Ardelean

Mirela Ardelean

Austria/Romania
APEX, PL/SQL, SQL

I am just an APEX enthusiast.

A while ago, I started as an Oracle Forms and PL/SQL Developer, went through a Business Analyst role, then a Technical Leader role. I get tired and in 2019 I decided to change the country and the role: I moved from Bucharest/Romania to Vienna/Austria to work as an APEX developer. And I like what I’m doing daily!

I am very much involved in the Oracle community world: I am the co-founder of the Romanian Oracle User Group (RoOUG), I am a board member of EOUC (EMEA Oracle Usergroup Community), board member of community support program Symposium42, co-founder and core team member of MASH (Mentor and Speaker Hub) Program, editor in chief of ORAWORLD e-magazine, event organizer and speaker at different conferences.

I love to travel, to do hikes or, at least, to do long walks.

Tobias Arnhold

Tobias Arnhold

Germany
sql, apex, plsql, oracle, postgres, webdevelopment

I am an Oracle APEX consultant with expertise in core and third party components. Besides my fable towards APEX I’m working in the Data Warehouse sector by creating complex BI analysis. I’m head responsible of the APEX track for the APEX Connect conference. I love conferences and sharing my knowledge.

Martin Bach

Martin Bach

Germany

Martin is a product manager at Oracle helping customers in Europe and around the world address their IT related problems. He is most interested in cloud technology, DevOps, Engineered Systems, and how these can be used best with Oracle technology.

Patrick Barel

Patrick Barel

The Netherlands
SQL, PL/SQL

Patrick Barel is a PL/SQL Developer for Qualogy in the Netherlands. Besides working with SQL and PL/SQL he wrote different plug-ins for PL/SQL Developer. He publishes articles on his own blog. In 2015 he received the Oracle Developer Choice Award in the PL/SQL Category. In 2019 he was promoted to Oracle ACE Director

Flora Barriele

Flora Barriele

Switzerland
Oracle database

I have an MSc in Computer Science from the University of Paris. I worked for 6 years as an IT operations engineer in a big telecommunication company. I then moved to Switzerland to start working as an Oracle Database administrator and I am hooked since then. I now work for Oracle, I’m specialized into migrating databases to OCI, in all shapes and sizes.
I love learning and also enjoy sharing. I am committed to encourage women in technology, inspire more girls to work in IT and promote diversity. Besides that, I enjoy traveling, going to concerts, and dancing. And having some beers.

Christian Berg

Christian Berg

Martin Berger

Martin Berger

Austria
performance, architecture, rdbms, sql

interested in IT since the '80s managing databases and their ecosystem since 2000 sharing content since 2008 interested how things work, break and can be improved

Adam Boliński

Adam Boliński

Ludovico Caldara

Ludovico Caldara

Switzerland
database, craft beer, volleyball, mountains, snowboard

I spent 20 years working as a DBA, consultant, and sysadmin with (many) databases, application servers, storage systems, and servers. I spent most of my time on automation, high availability, and observability. Oracle has become the natural choice for my professional career over the years. In 2012 I moved from Italy to Switzerland and I started contributing to the community, for which I’ve been awarded the ACE Pro status in 2014 and ACE Director in 2016. In 2020 I jumped the fence and joined Oracle as a Product Manager. Since then, I help big customers with big problems 🙂
In my personal life, I take care of three kids, I play in a local volleyball team, I enjoy craft beer and metal concerts, and when the conditions allow for it, I love going for a splitboard ride.

Gianni Ceresa

Gianni Ceresa

Switzerland
Analytics, Graphs, Data in general

A Data enthusiast more widely interested in BA/DW/EPM solutions with a special focus on Oracle products and solutions. Oracle ACE Director, owner of DATAlysis LLC, a consulting company in Switzerland, he has more than 10 years of experience in multiple project roles like architect, analyst, team lead and developer, bridging together the business and the technical side of the BA world.

His other activities include training delivery, R&D, blogging and supporting the Oracle community on the forums and by presenting at multiple events.

Neil Chandler

Neil Chandler

tl;dr Database Guy. Knows things.

Neil has been working in IT since 1988 when he coded 360-Assembler and Cobol on IBM Mainframes against both hierarchical (NoSQL-ish) and relational databases.

He started using Oracle software in 1991. He is an independent consultant who specialises in Performance Tuning, Exadata, RAC, DataGuard, Goldengate, Upgrades, Data Migration, with some Python, PL/SQL and Apex Development for good measure.

He also has extensive experience with other relational databases, NoSQL databases, and Linux and AIX administration.

Neil is an Oracle ACE Director, and Chair of the UKOUG. He likes to drink strong smooth Italian coffee, good beer and better whisky, depending upon the time of day.

Maria Colgan

Maria Colgan

USA
SQL, autonomous database

I’m what some people would call a database nerd and have spent my entire career deeply involved with enhancing the performance of databases and applications. My personal mission is to help companies attain the flexibility and resilience they need (especially in today’s ever-changing world) by assisting them in making better use of Oracle’s incredible technology. I find great satisfaction in listening to and incorporating their feedback into future product releases. I’m the primary author of the SQLMaria blog https://sqlmaria.com and a contributing author to the Oracle Optimizer blog http://blogs.oracle.com/optimizer.

 

 

 

 

 

 

maria.colgan@oracle.com

 

 

 

pieter de visser

pieter de visser

Belgium

Piet is an experienced Database Consultant and DBA. He is in IT since 1987, and specialises in Oracle-, Postgres- and Databases-related technology since 1994. He combines conceptual knowledge and technical know-how with extensive experience in global and complex organisations. He also invests a lot of effort in maintaining a network of Like-Minded database-specialists worldwide and is a regular speaker at international user group events and symposia. Piet likes to Travel, speaks various languages more or less fluently, and is alway interested in learning how to say "Hello" and "Thank You" in a few more languages (provided he can learn it in-situ).

Mike Dietrich

Mike Dietrich

Germany
upgrades, migration, patching, tuning, autonomous

Based in Bavaria, Germany. more than 30 years IT experience. Holding a degree as Graduate Engineer (Dipl. Ing. NT/DT) in Data Systems and Information Technology of Georg-Simon-Ohm Technical University, Nürnberg, Germany.

Senior Director Product Management, Oracle Database Upgrade, Migrations and Patching, leading a global expert team of upgrade and migration specialists, being at Oracle for over 25 years. Interlink between customers/partners and the Oracle Upgrade Development. Holding technical workshops between Arctic and Antarctica, and of course virtually too. Assisting customers in their reference projects onsite and remotely worldwide. Troubleshooting upgrade, migration and patching issues. Eager to learn something new every day. Experienced conference speaker. Music lover. LP/vinyl enthusiast. Mountain hiker. Cyclist.

Philippe Fierens

Philippe Fierens

Jasmin Fluri

Jasmin Fluri

Switzerland
Database, DevOps, CI/CD

Jasmin Fluri works as a Database DevOps Consultant at Schaltstelle in Bern and lectures on software engineering and databases at the University of Applied Sciences North-Western Switzerland in Windisch. She’s part of the Oracle ACE program as an Oracle ACE Pro. Her focus as a consultant lies in database CI/CD and automation.

Julian Frey

Julian Frey

Switzerland
Oracle Database

Julian Frey works as an independent Expert Oracle Database Consultant. During his more than 10 years of consulting he has gained a lot of experience in many areas, especially in the areas of HA, Engineered Systems and Monitoring. He is a frequent speaker and founder of the Oracle Beer Bern Meetup Group.

Milena Gerova

Milena Gerova

Bulgaria

President of Bulgarian Oracle Users Group for 20 years. Oracle SQL and PL/SQL developer, database designer, project manager and team player.

Tim Hall

Tim Hall

UK
oracle, sql, plsql, automation, dba, developer

Tim Hall is an Oracle Certified Professional (OCP) DBA/Developer, Oracle ACE Director, OakTable Network member and was chosen as Oracle ACE of the Year 2006 by Oracle Magazine Editors Choice Awards. He has been involved in DBA, design and development work with Oracle databases since 1995.

Although focusing on database administration and PL/SQL development, he has gained a wide knowledge of the Oracle software stack and has worked as a consultant for several multi-national companies on projects ranging from real-time control systems to OLTP web applications.

Since 2000 Tim has published over 1,000 articles on his website (oracle-base.com) covering a wide range of Oracle features.

Kim Berg Hansen

Kim Berg Hansen

Denmark
SQL, PL/SQL

I’m a database developer from Middelfart in Denmark. Originally wanting to work with electronics, I almost coincidentally tried computer programming and discovered where my talent lay, as the programs I did worked well – unlike the electronics projects I soldered that often failed. After that experience I progressed from Commodore Basic on VIC-20 over Modula-2 and C at Odense University to Oracle SQL and PL/SQL, which last two languages I now have worked with extensively since the year 2000. My professional passion is to work with data inside the database utilizing the SQL language to the fullest to achieve the best application experience for the users.

I am sharing my experience and knowledge by writing the Practical Oracle SQL book, blogging, presenting at various Oracle User Group conferences, on the Kscope conference committee of ODTUG, member of the MASH Program core team, and being the SQL quizmaster at the Oracle Dev Gym. My motivation is when peers go “now I understand” after my explanations, or when end users “can’t live without” my application coding. I’m certified Oracle OCE in SQL as well as awarded Oracle ACE Director. Outside the coding world I’m married, love to cook, and am a card-carrying member of Danish Beer Enthusiasts association.

Sabine Heimsath

Sabine Heimsath

Frits Hoogland

Frits Hoogland

Øyvind Isene

Øyvind Isene

Norway
Oracle, SQL, APEX, optimisation

Independent Oracle DBA and developer consultant. Work on optimisation (aka tuning), database development, APEX, SQL & PLSQL. I can do most of what an Oracle DBA should do, but I do more development these days. On a good day I believe I have good analytical skills.

I can talk to both developers and DBAs.

Live in Arendal, Norway.

Enjoy networking with humans, beers and stuff.

Patrick Jolliffe

Patrick Jolliffe

Portugal
database

Patrick started as a C Developer, before gradually migrating towards Database Administration, focused mainly on Oracle performance.
He spent some time living and working in Hong Kong, and now resides in Portugal where he still does a little remote work, and spends the rest of the time walking his dog, watching movies, tentando aprender a língua, and generally recovering from his time in Hong Kong.
Patrick has presented at various international Oracle usergroup and open-source conferences.

Martin Klier

Martin Klier

Deutschland/Germany
Oracle, Database, Performance, HighAvailability, Integration

Being in IT business as a specialist for Linux, Martin Klier has been involved in the administration of Oracle Databases for about fifteen years now. The integration of large Oracle-based high-availability solutions (MAA) with RAC and Data Guard were the first challenges. In later years, he largely moved into performance analysis and tuning of complex systems with dynamically changing load profiles. Skeptical needs assessments, thorough architecture planning, decent system sizing, critical benchmarking and experienced load-focused system analysis are Martin’s formula to success in avoiding production downtime.

Martin is co-founder of https://www.performing-databases.com and works there as a Senior Database Expert.

For years now, Martin can be found speaking on topics regarding “Oracle Core, Performance and High Availability” on various national and international conferences, like COLLABROATE (IOUG), Oracle Open World or DOAG Konferenz. Martin frequently blogs about recent issues and their solutions at https://www.usn-it.de and is known on Twitter as @MartinKlierDBA.
Martin works a lot for the community, especially for the German Oracle Users Group “DOAG” and Linux User Group Mitterteich, and is an Oracle ACE Director (Database).

Radosław Kut

Radosław Kut

Poland
Oracle DBA, Linux, IaaS, HA

As a student of Electronics and Telecommunications at the AGH University of Science and Technology in Cracow, he came across Sun Microsystems technologies, which determined his professional life for the years to come. Fascinated by the operation and architecture of IT high availability systems - an Oracle Database, Linux, Exadata Database Machine, virtualisation, coding, problem solving, diving into internals and of course clouds appeared on the path of his already seventeen-year career. Nowadays working with ORA-600 Database Whisperers and proudly supporting POUG, Sym42 community. I love nature, photography, cycling, running, hiking, learning, playing chess, ...

Monika Lewandowska

Monika Lewandowska

Jonathan Lewis

Jonathan Lewis

UK
CBO, Core RDBMS, Trouble-shooting

I’ve been a self-employed IT professional since January 1983, an Oracle user since 1988, and I’ve specialised in short-term assignments since 1994. I’m now nearly retired but still participate in the Oracle community through conferences, social media and my blog. What used to be my work is now one of my hobbies, though I can still be tempted out of retirement for interesting problems.

Other pastimes include: baking bread, growing vegetables, and learning how to prune fruit trees.

Roger MacNicol

Roger MacNicol

United States

Roger is a Software Architect for Oracle’s Data & Storage Technology group. He has worked on core database internals for 37 years and at Oracle for 17 years. He has worked on implementing Table Scans, Hybrid Columnar Compression, Exadata Smart Scan, Big Data SQL, and Database In-Memory. Before Oracle, he was the architect for Sybase IQ Query Engine – the world’s first commercial columnar database and was the first chairman of the TPC-H subcommittee.

Roger lives on a farmette in Lancaster Country, Pennsylvania and plans to raise sheep when he retires. Both of his neighbours are Amish.

Connor McDonald

Connor McDonald

Oren Nakdimon

Oren Nakdimon

Israel
Database, SQL, PL/SQL, Data Modelling, Optimization

I’m a proud Sym42 member and an Oracle ACE Director with 30 years of extensive and continuous experience with Oracle-based systems, as a developer, DBA, manager and instructor.

I gained lots of knowledge about databases in general, and Oracle in particular, and I like sharing it – by blogging, tweeting, presenting in local and international conferences, and more.

I’m the Director of Data Management in Moovit, and I help running ilOUG – the Israeli Oracle User Group.

Jen Nicholson

Jen Nicholson

United States
Community

Jennifer works at Oracle in the Database Product Development organization and focuses on Community programs. She manages the Oracle ACE Program and works closely with many Oracle User Groups. She enjoys collaborating with Oracle customers, partners, and user groups on conferences, speaking opportunities, product launches, case studies, videos and other initiatives.

Samuel Nitsche

Samuel Nitsche

Samuel Nitsche is a curiosity-driven software developer who is programming, learning, and collaborating in the software trade since the early 2000s.
His primary interest is in modern database development, automated testing, and code quality, topics he writes regularly about on different platforms (e.g. his blog https://developer-sam.de, Simple-Talk, and several Oracle-related print magazines).
He is an Oracle ACE, a Symposium 42 member, a MASH (Mentor and Speaker Hub) core member, and one of the main contributors and maintainers of utPLSQL.

As a workshop facilitator, speaker, and keynote speaker he loves to share his experience in an entertaining way – gladly collaborating with plush animals and using lightsabers – at meetups and conferences.

Luiza Nowak

Luiza Nowak

Poland
event organizing, presentations, community building

I am a co-founder of POUG – Polish Oracle User Group – which I’ve been developing for over 7 years now. In my other, not-so-secret life, I am an Employer Branding Specialist in a media company. I also like to talk about presentations and slide design  – I’m doing workshops on both of those topics.

I like the Harry Potter saga, cats, and visiting new countries.

Franck Pachot

Franck Pachot

Switzerland
SQL, Database

I’m now a Developer Advocate for YugabyteDB (Open Source PostgreSQL-compatible Distributed SQL Database) after 20+ years of database consulting in dev and ops. Love to share and learn, charring on Twitter, writing on dev.to, meeting people at conferences.

  • Long experience with Oracle Database: Oracle DBA certified (OCM 11g & 12c). Oracle ACE Director Alumni.
  • Some experience with AWS: Database specialty certified, AWS Academy Educator, and AWS Data Hero.
  • Recent enthusiasm for Distributed SQL databases
Marcin Przepiorowski

Marcin Przepiorowski

Ireland/Poland
Oracle database, DevOps, beer
Peter Raganitsch

Peter Raganitsch

Erik Roon

Erik Roon

The Netherlands
SQL, PLSQL

Erik van Roon is an Oracle Database Developer and Oracle ACE Pro, who has worked with Oracle technology since 1995, specializing in, but not limiting to, SQL and PLSQL.
Since 2009 he is self-employed. His company is called EvROCS.
Prior to that he has worked for several consulting companies in the Netherlands.
He has worked on major projects for several clients in industries like entertainment, banking and energy.
Erik has been the technical lead of multiple successful high impact data-migration projects moving and transforming large amounts of data.
He’s been a speaker at many conferences in Europe and the United states.
He is a board member of community support program Symposium42, and is a co-founder and core member of the MASH program which mentors new speakers during their first steps as a speaker.

Philipp Salvisberg

Philipp Salvisberg

Switzerland
Data modeling, application development

Philipp Salvisberg is a senior principal consultant at Trivadis and an Oracle ACE Pro. He has been focusing on Oracle database based solutions since 1988. At that time with Oracle Database version 5. Since then, he is helping customers design, build and optimize their database centric solutions, teaching application development topics or speaking at conferences.

Philipp has a soft spot for doing as much as possible in a single SQL statement and is interested in pretty much everything to use the database as efficiently as possible. He likes to design model-driven software solutions using domain specific languages, while getting the most out of the underlying technologies.

Chris Saxon

Chris Saxon

UK
SQL, PL/SQL

I’m Chris Saxon, Oracle Developer Advocate. I’m here to help you get the best out of Oracle Database and (hopefully!) have fun doing so.

To aid you with this I’m the author of the database design quiz on the Oracle Dev Gym, create videos on The Magic of SQL, blog at All Things SQL, and post daily SQL tips on Twitter.

If you have questions about SQL, please submit them to me on Ask TOM.

Dani Schnider

Dani Schnider

Switzerland
Oracle, SQL, PL/SQL, DWH

Dani Schnider works as Principal Oracle & DWH Consultant for Callista, a Swiss IT service provider for consulting and engineering. He has been working in database consulting for over 20 years, from 1999 to 2022 for Trivadis in Switzerland. Dani works with Oracle databases since 1994, since 1997 mainly in data warehouse projects.

His tasks include DWH architecture reviews, data modeling, ETL development and performance optimization in Oracle databases. Dani is Oracle ACE Director and co-author of the books “Data Warehousing mit Oracle – Business Intelligence in der Praxis” and “Data Warehouse Blueprints”, both published in German by Hanser-Verlag. On his blog “Data Warehousing with Oracle” he writes about design and performance topics related to Oracle data warehouses. He is a regular speaker at international Oracle user group conferences.

Fernando Simon

Fernando Simon

Luxembourg
exadata, exacc, zdlra, high availability, maa,
Jeff Smith

Jeff Smith

United States

I am a product manager at Oracle, on the database team. I help make SQL Developer, SQL Developer Web, SQLcl, and REST Data Services (ORDS) a better experience for our developers and customers.

I’ve been helping make Oracle Database tools since 2001, with the first decade coming from a company called Quest Software.

I’m addicted to social media, so you’ll see me tweeting much, too much. If you want to join ‘the gang’ – I maintain a list of active Twitter accounts that talk about all things Oracle.

If you’d like to have me present our technology to your team, user group, or close family and friends, feel free to drop me a line at jeff.d.smith@oracle.com.

My hobbies include lifting weights, visiting breweries, hiking, collecting bourbon, and annoying Martin.

Kamil Stawiarski

Kamil Stawiarski

Brendan Tierney

Brendan Tierney

Ireland
Playing with Wood

I spend my days slicing and dicing, deriving insights, taking research to the enterprise while cutting through the unnecessary BS from the research. When I’m not doing that I play with wood, particularly hard wood. A table or object is something I design, create and use in these different very different roles.

SELECT * FROM wood WHERE type = ‘HARD’;

Francesco Tisiot

Francesco Tisiot

Francesco comes from Verona, Italy and works as a Senior Developer Advocate at Aiven. With his many years of experience as a data engineer, he has stories to tell and advice for data-wranglers everywhere. Francesco loves sharing knowledge with others as a speaker and writer, and is on a mission to defend the world from bad Italian food!

Martin Widlake

Martin Widlake

United Kingdom
Oracle RDBMS, SQL, PL/SQL, VLDB, Exadata, Database Design, Performance tuning, chainsaw skills

A semi-retired Oracle development DBA. For many years I have focused on database design, performance, PL/SQL, and general Oracle architecture. I’ve worked on VLDBs for the majority of my career, I both love and hate both RAC and Exadata.

I’ve been presenting on both Oracle and soft skills topics since 2003, all across Europe and sometimes further afield. I am passionate about the Oracle community, having filled many roles for UKOUG from presenter through SIG chair to conference organiser and finally President. I’ve also supported many small communities and was one of the three people behind London Oracle Beers. I am a member of the OakTable network, and Oracle ACE Pro (and former ACE Director) and am now president of SYM42.

Outside of the Oracle world my main love is science, especially biology generally and genetics specifically (I have a degree in genetics and zoology, but don’t aske me identify any living creature!). I am a cat fanatic, a lover of beer & wine, and enjoy industrial gardening