Quentin Docter, A+, Network+, IT Fundamentals+, Cloud Essentials+, is an IT consultant who started in the industry in 1994 working in tech support for Packard Bell. Since then, he?s worked as a tech and network support specialist, trainer, consultant, and webmaster. During his career, he has achieved certifications from CompTIA, Microsoft, Cisco, Novell, and Sun Microsystems. He has written over a dozen books for Sybex, including the CompTIA IT Fundamentals+ Study Guide and the CompTIA Cloud Essentials+ Study Guide.

Jon Buhagiar, A+, Network+, is an information technology professional with two decades of experience in higher education. During the past 22 years he has been responsible for Network Operations at Pittsburgh Technical College and lead several projects, including virtualization (server and desktop), VoIP, Microsoft 365, and many other projects supporting the quality of education at the college. He has achieved several certifications from CompTIA, Cisco, and Microsoft, and taught many of the certification paths. He is the author of several books, including Sybex's CompTIA Network+ Review Guide.

Troy McMillan holds more than 30 IT certifications including A+ and Network+. He is a Product Developer and Technical Editor for CyberVista (formerly Kaplan IT), helping individuals and organizations train on technology and prepare for technology certifications. Troy is also a full-time trainer, teaching CompTIA, Cisco, Microsoft, and Wireless classes. He authored previous editions of CompTIA A+ Complete Review Guide from Sybex.

Audrey O'Shea, A+, ITF+, Project +, Network +, Security+, and other industry certifications, is a professional educator. After a successful career in information technology, she turned to teaching and has taught courses in computer technology, electrical theory and practice for energy workers, general electronics, and other related fields. She holds a variety of computer industry certifications and is a member of the Phi-Kappa-Phi honor society, and active in helping young women prepare for STEM careers.