Justin Horn
OSINT & privacy specialist · founder of ThumperSecure
Justin Horn is an open-source intelligence (OSINT) and digital-privacy specialist based in Cherry Hill, New Jersey. Through ThumperSecure he builds open-source tools for investigation, privacy hardening, and helping people take their personal data back from data brokers. Before his work in security, he spent over a decade (2005–2018) as a DJ and emcee — working weddings, bar and bat mitzvahs, and nightlife, including with EBE Talent — and went on to found his own entertainment company, 2 Life Talent.
What I work on
My focus is practical OSINT and privacy: tools that find signal in public data, visualize how it connects, and give ordinary people a realistic way to reduce their exposure online.
Selected projects
nightcrawler + lightcrawl
A crawler that discovers sources and a pipeline that scores them for relevance, surfacing the connections that matter instead of raw volume.
opt-out-manual-2026
A practical, maintained manual for removing yourself from the major people-search and data-broker sites.
ghostvisor
Tooling and writing around knowing when and how you are being watched, and what to do about it.
Open knowledge wikis
Static, openly published reference wikis on civic and anti-fraud topics, built to make dense public-interest material searchable.
Earlier: entertainment
From 2005 to 2018 Justin was a working DJ and emcee across the Philadelphia and South Jersey region, performing at weddings, bar and bat mitzvahs, and nightlife events. He performed with EBE Talent and founded his own agency, 2 Life Talent, representing DJs, emcees, and performers for private and corporate events.