Duffy, Christopher (Personal Name)

Duffy, Christopher. Learning penetration testing with Python, September 2015: title page (Christopher Duffy) fifth unnumbered preliminary page (currently leads cybersecurity and penetration testing engagements globally; for almost a decade prior to private sector work, was a cyber warfare specialist, senior systems engineer, and network infrastructure supervisor for the United States Air Force; holds 23 certifications, a degree in computer science, and a master's degree in information security and assurance)