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Learn more about the networking professionals who lend their experience to help you achieve your goals

To create its highly regarded networking information products, Certification Zone has always relied on a skilled group of world-class experts, who are certified and experienced, to write and develop our Cisco certification preparation products. Instead of using just one or two networking professionals to address the multitude of topics addressed on Cisco's certification exams, Certification Zone finds experts in each topic who have hands-on field experience with the technologies they cover for our site.

Galina Pildush

Marvin Greenlee

Priscilla Oppenheimer

Shirley Myers

David Wolsefer

Certification Zone Study Guides by David Wolsefer:

David Wolsefer is the East Coast Senior Networking Engineer for Totality, a leading Managed Services Provider (MSP) headquartered in San Francisco. David is a Cisco Certified Internetworking Expert (CCIE) #5858 in Routing and Switching and is currently scheduling a lab date to attempt a second CCIE in the Communications and Services track. David is also a Microsoft Certified Systems Engineer (MCSE). His areas of expertise include LAN/WAN infrastructure, network security, and IDC/ASP data center design and implementation. David holds a bachelor's degree from the University of Florida and has completed extensive post-graduate work in Applied Mathematics.

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