A lot of technical authors have issued many IT certification books. Here you will find the most famous in the world of computer networking.
Jeremy D. Ciaora, CCIE#11727, is by far the most famous technical writer for everyone who begins his journey with CBT Nuggets. He is the idol of many starters. He has a funny and engaging style of teaching complicated material and simplifying it with hand-made diagrams. He taught CCNA- and CCNP-level certification video courses with CBT Nuggets. Other than that, He is the owner of an IT consulting company he named AdTEC Networks. He lives in Arizona.
Michael specialized in network design, implementation and VoIP since 1996. He is a Cisco certified instructor. He is currently focusing on developing multimedia courses on Cisco technologies and Unified Communications. He holds Cisco CCNA, CCDP, CCNP and CCVP certifications. He lives in Canada.
Josh is CCIE No. 25707, . He currently works at Iron Bow Technologies, a Cisco Gold and Master Unified Communications Partner. Josh became one of the youngest Voice CCIEs in the world and you probably knew him when he was giving lectures for Internetwork Expert, a leading CCIE training company. Some of the certfs that Josh holds are: Cisco CCIE Voice, CCNP, CCDP, CCNA, CCDA, and Cisco Meeting Place Specialist.
Dennis J. Hartmann
Dennis is CCIE No. 15651, and a Unified Communications consultant. Dennis is a full-time contractor with DC-NET. He used to work with High Point Solutions and occupied the role of President of White Pine Communications consulting and education.