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Publishizer
500 GlobalAmsterdam, NL · 3 known investors
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Publishizer is a crowdpublishing platform that helps authors validate their book ideas, build reader lists, and secure publishing deals through pre-sales campaigns. The platform serves independent and aspiring authors seeking to launch their books with publisher backing or self-publish with audience support.
Founders & leadership
GV
Guy VincentFounder & CEO2014–2019Guy Vincent founded Publishizer, a crowdpublishing platform launched in 2015 that helped authors validate book concepts and secure publishing deals. He is now building Amsterdam Circular, a circularity accelerator developed with AMS Institute and the City of Amsterdam focused on financing for circular economy founders.
LC
Lee ConstantineCo-founder & Head of Growth2015–2022Lee Constantine is founder of Publishizer, a crowdpublishing platform that helps authors validate book ideas and secure publishing deals through pre-sales campaigns. He previously worked on go-to-market and AI products for consumer brands.
MB
Martin Brochhaus
DB
Dr. BaucomHead of Publisher Relations
Investors · 3
500 Global✓ confirmed by PublishizerPalo Alto · $150K
How we know: the company's own site · open dataset · 500 Global portfolio 2026-08 · Not right? Tell us
In the news
Frequently asked questions
- What does Publishizer do?
- Publishizer is a crowdpublishing platform that helps authors validate their book ideas, build reader lists, and secure publishing deals through pre-sales campaigns. The platform serves independent and aspiring authors seeking to launch their books with publisher backing or self-publish with audience support.
- Who founded Publishizer?
- Publishizer was founded by Bethany Marshall, Guy Vincent, Lee Constantine, Martin Brochhaus.
- Who are Publishizer's investors?
- Publishizer's investors include 500 Global, Arches Capital, Rockstart.
- Where is Publishizer headquartered?
- Publishizer is headquartered in Amsterdam, NL.