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Meet the Experts

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

Katherine Tallis

Certification Zone Study Guides by Katherine Tallis:

Firewalls

OSI Reference Model, 2nd Ed.

Katherine Tallis is a senior WAN Engineer with Lockheed Martin Corporation. While working as a graduate student in Psychology she started writing statistical programs for mainframe computers and eventually migrated into technical support and consulting.

She has spent more than 15 years working in Federal and private industry on networks ranging from a single office with a handful of devices, to global WANs with hundreds of routers, Novell servers, and workstations.

Katherine has completed her CCNA, CCNP, and Cisco Security Specialist certifications and is currently working on her CCIE.

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"As a Cisco CCNA Academy instructor I find the additional information extremely helpful in preparing myself for class presentations as well as checking my own knowledge."

John Fialko
CCNA Networking Academy Instruct
Ft. Collins, CO
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