William David Callahan
Senior Red Hat Instructor and Examiner at Niit
Based in Avinger, United States
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Seniority
Staff
Department
Other
Location
Avinger
Industry
E-Learning Providers
Company size
1.8K
Contact information
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w•••••••@niit.com
Phone
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Background
About William David Callahan
I train system administrators all over the world!
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