Tom Brennan
Chief Executive Officer at Mandelbaum Barrett PC
New Jersey, United States
Summary
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SeniorTom Brennan is a veteran-led cybersecurity executive and founder with over 12 years of experience building and advising risk-driven technology programs from the C-suite. As CEO of Proactive Risk and vCIO at Mandelbaum Barrett, he blends hands-on technical services—penetration testing, secure development, MDR—with strategic digital transformation and legal-tech optimization. He has a long track record of industry stewardship, having led OWASP NYC, chaired CREST North America, contributed to MITRE, and served on multiple academic and nonprofit advisory boards. Tom helps mission-driven organizations boost resilience through nonprofit coalitions and hands-on assessments using CISA frameworks, reflecting a practical focus on measurable security outcomes. His background spans government, consulting, industry threat intelligence, and even cyber investigations, giving him a rare view across adversary, defender, and policy perspectives. Based in New Jersey, he combines veteran discipline with a collaborative approach to make security simple and business-focused.
12 years of coding experience
16 years of employment as a software developer
Stackoverflow
156reputation
1kreached
5answers
0questions
Github Skills (18)
penetration-testing10
shiny10
methodology10
infosec9
testing9
hacking9
dos9
pentesting9
zos6
mainframe6
uss6
ispf6
datasets6
linked-open-data2
creative-commons2
Programming languages (2)
Github contributions (5)
proactiveRISK/switchblade
Apr 2014 - May 2020
Contributions:3 commits, 1 push, 1 comment in 6 years 2 months
testingtesting-toolsdos
brennantom/hackazon
Dec 2015 - Jan 2016
Contributions:1 push in 1 month
vulnerablesecurityvulnerable-web-app
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