Patrick Baumgartner works as a passionate software craftsman at 42talents and builds software with Java/JEE, Spring Framework, OSGi, NoSQL databases, and other open source technologies. Since he began working with Neo4j in 2010, he sees the whole world as one big connected graph.

He is the host of the Neo4j Zurich and the Software Craftsmanship Zurich Meetup group and is actively involved in the agile community in Switzerland.

As a Spring trainer and Neo4j master instructor, he conducts various training and workshops on the topic, is an active speaker at conferences and events, and lectures at technical colleges. In his free time, he likes to explore Rik's Beer Graph or his own Single Malt Whisky Graph and tries to find routes to beautiful places.

Patrick has coauthored the German book, OSGi für Praktiker, with Bernd Weber and Oliver Braun and reviewed Scala - Objektfunktionale Programmierung by Oliver Braun.

Sonal Raj is a hacker, Pythonista, big data believer, and a technology dreamer. He has a passion for design and is an artist at heart. He blogs about technology, design, and gadgets at http://www.sonalraj.com/. When not working on projects, he can be found travelling, stargazing, or reading.

He has pursued engineering in computer science and loves to work on community projects. He has been a research fellow at IISc Bangalore and has taken up projects on graph computations using Neo4j and Storm. Sonal has been a speaker at PyCon India and local meetups about Neo4j, and has also published articles and research papers for leading magazines and international journals. He has contributed to several open source projects. Presently, Sonal works at Goldman Sachs.

He is the author of Neo4j High Performance and has reviewed titles on Storm and Neo4j.

Daniel Vaughan has worked as a software developer for over 15 years and is still learning every day. He first started using Neo4j in 2010, and currently works for the European Bioinformatics Institute, Hinxton, Cambridge, UK. He is married to Michelle and lives in the quaint market town of Saffron Walden.

Daniel has previously authored Ext GWT 2.0, Beginner's Guide and worked on the Spring Web Services 2, Cookbook, both by Packt Publishing.

His website is http://www.danielvaughan.com and you can find him on Twitter at @DanielVaughan.