David D. Coleman is the Director of Product Marketing for Extreme Networks, www.extremenetworks.com. David is a public speaker and proficient technical author, who specializes in Wi-Fi and cloud technologies, and is a member of the Extreme Networks Technical Evangelism team. David travels the world for both customer and channel partner engagements, speaking events and training sessions. He has instructed IT professionals from around the globe in Wi-Fi design, security, administration, and troubleshooting. David has written multiple books, blogs, and white papers about wireless networking, and he is considered an authority on 802.11 technology. Prior to working at Extreme, he specialized in corporate and government Wi-Fi training and consulting. In the past, he has provided Wi-Fi consulting for numerous private corporations, the US military, and other federal and state government agencies. When he is not traveling, David resides in Atlanta, Georgia. David is CWNE #4 and is the co-author of Sybex Publishing’s “Certified Wireless Network Administrator (CWNA) Study Guide” – 5th Edition”.