JJ Ben-Joseph is the founder and CEO of TensorSpace, a U.S. software company, and the editor of Fondsites. He is an engineer by trade: before TensorSpace, he worked with national-security and biosecurity programs, including time at IQT (In-Q-Tel) and as an Entrepreneur-in-Residence at AION Labs. Public profiles also note fellowships with the Johns Hopkins Center for Health Security, the American Jewish Committee, and the Foresight Institute, along with graduate study in computer science.
On Fondsites, that background is used two different ways, and it is worth being precise about which is which.
As a practitioner. The Cybersecurity Encyclopedia and the Synthetic Biology Lab sit closest to JJ’s professional work in security and biosecurity, and they are written accordingly — anchored to NIST, CIS, and MITRE frameworks in the one case, and to a careful safety posture in the other. The Arcade ’s simulations and the Workbench ’s calculators are his engineering work directly: hand-written WebGL and JavaScript, physics measured in Blender and checked with unit tests.
As an editor. The rest of the maintained libraries — air, water, home energy, sleep, speech, Jewish life — are subjects JJ edits rather than practices professionally (Jewish life being the personal exception). There, the byline means what the editorial policy says it means: he is the person who reviewed the page, checked its sources, and is accountable for what it claims. Pages in those libraries lean deliberately on cited authorities — ASHA, the EPA, the DOE, the CDC — rather than on personal authority.
The goal across all of it is the same: not trend-chasing summaries, but reusable explanations and working software that help readers understand how things actually work — and come back with sharper questions the next time.