Hans-Jürgen Schönig is the founder and CEO of Cybertec Schönig & Schönig GmbH (www.postgresql-support.de), a company that focuses on PostgreSQL support, training, and consulting, as well as on scalable PostgreSQL solutions.
He has 15 years of experience in the field of PostgreSQL and has written several books that deal with PostgreSQL in the past couple of years.
Sheldon E. Strauch is a 20 year veteran of software consulting at companies such as IBM, Sears, Ernst & Young, and Kraft Foods. He has a Bachelor's degree in Business Administration and leverages his technical skills to improve business self-awareness. His interests include data gathering, management, and mining; maps and mapping; business intelligence; and application of data analysis for continuous improvement. He is currently focused on the development of end-to-end data management and mining at Enova International, a financial services company located in Chicago. In his spare time, he enjoys the performing arts, particularly music, and traveling with his wife Marilyn.
Vasilis Ventirozos has been working with databases for more than a decade on mission critical applications for companies in both the telecom and lottery industries. While he has worked with a number of database technologies, he considers PostgreSQL his database of choice. He currently works at OmniTI, a full-stack IT services company focused on highly scalable web infrastructure, providing PostgreSQL-related consulting and management.
Tomas Vondra has been working with PostgreSQL since 2003; although he's been working with various other databases since then (both open source and commercial), he instantly fell in love with PostgreSQL and the wonderful community built around it.
He is currently working at GoodData, a company that operates a BI cloud platform built on PostgreSQL, as a "performance specialist" and is mainly responsible for tracking and improving performance. In his free time, he's usually writing PostgreSQL extensions and patches or hacking something else related to PostgreSQL.