Patrick Barel is a PL/SQL developer for AMIS Services (http://www.amis.nl/) in the Netherlands. Besides working with SQL and PL/SQL, he co-developed CodeGen together with Steven Feuerstein, and has written different plugins (http://bar-solutions.com/) for PL/SQL developer at (http://www.allroundautomations.com/). He publishes articles on AMIS Technology Blog (http://technology.amis.nl/blog) and on his own blog (http://blog.bar-solutions.com).
He has been a reviewer for several books including Oracle PL/SQL Programming by Steven Feuerstein. He has been an Oracle ACE since 2011.
Nassyam Basha is a database administrator and an Oracle ACE Director. He holds a master's degree in Computer Applications from the University of Madras. He is an Oracle 11g Certified Master and Exadata implementation specialist, and has good knowledge of Oracle technologies, such as Data Guard, RMAN, RAC, and Exadata. He actively participates in Oracle-related forums, such as OTN, where he has superhero status. He maintains an Oracle-technology-related blog (www.oracle-ckpt.com) and has coauthored Oracle Data Guard 11gR2 administration beginners guide, Packt Publishing. He actively writes many articles on OTN in various languages. He is a speaker at OTN, IOUG, and SANGAM, and he is the co-founder of Oraworld-team (www.oraworld-team.com). He is part of the AIOUG community on Twitter, where he occasionally expresses his views via the Twitter handle @AIOUG. He is currently working with Pythian as an Oracle database consultant.
Nassyam Basha has written Oracle Data Guard 11gR2 Beginner's Guide, Packt Publishing.
Wissem El Khlifi is the first Oracle ACE in Spain and an Oracle Certified Professional DBA with over 12 years of IT experience.
He earned his Computer Science engineering degree from FST Tunisia, his master's degree in Computer Science from the UPC, Barcelona, and another master's degree in Big Data Science from the UPC, Barcelona.
His areas of interest are Linux System Administration, Oracle ERP and Databases (RAC and Dataguard), big data NoSQL database management, and big data analysis.
His career has included the roles of Oracle and Java analyst/programmer, Oracle DBA, architect, team leader, and big data scientist. He currently works as senior database and application engineer for Schneider Electric/APC.
He writes numerous articles on his website, http://www.oracle-class.com, and you can contact him via Twitter at @orawiss.
Davor Zelic is an IT professional with more than 15 years of experience in designing, developing, and implementing IT systems.
After getting his master's degree in Electrical Engineering, he began his professional career working with Oracle technology in the Croatian IT company TEB Informatika. For more than 10 years, Davor worked on IT projects related to road management, where he gained extensive experience working as an Oracle SQL, PLSQL, Forms, and Reports and Spatial developer. He has proved his knowledge by becoming an Oracle Certified Professional issued by the Oracle Corporation.
Apart from Oracle technology, Davor has gained expertise in design and development of geographic information systems for collection, storage, transformation, analysis, and visualization of geo-referenced data. He originally worked with Intergraph technology, but later his focus moved to open source GIS technologies, such as Geoserver and OpenLayers.
Davor currently works as a software architect at the IT department of Croatian Central Bank, designing software solutions for Croatian financial market data collection and analysis.