Justin Stone
About Justin Stone
Justin Stone is the Co-Founder and Managing Partner of JZ Law, based in Boca Raton, Florida. The Angel Registry describes him as a venture finance and healthcare regulatory attorney.
He has served as Chief Legal Officer for three VC-backed startups that later became unicorns: MDLIVE, Thirty Madison and Papa. CityBiz describes him as a digital-health operator and general counsel to some unicorn health-tech companies.
The LinkedIn URL supplied with this profile appears to belong to a different Justin Stone, an audit partner at KPMG US. It is not linked here. Crunchbase also has a Justin Stone profile for the founder of Surfdome. That profile is not used on this page either.
The only angel investment we could confirm is Betterness. He is listed among the investors in its seed round on Crunchbase, in press coverage and in the Angel Registry update of April 29, 2026. We found no public record of other angel investments, an investing history or a portfolio count.
Betterness is a Miami-based company that runs an augmented wellness platform. It announced a $2.5M seed round in April 2026 alongside the launch of Bett-i, a voice-first AI life-coaching system. Other investors in the round include Martin Varsavsky, Mark Rosenbloom, Rabin Rahmani, Lloyd Camper and Carlos Domingo.
The company says the funding supports its move toward an agent-first infrastructure platform for the health and wellness industry. This is the only AI round we could confirm for Justin Stone.
With one confirmed deal, there is not enough public information to describe a thesis. The Betterness round was a seed-stage investment in AI-enabled digital health and wellness. His professional background is in healthcare regulation and venture finance, so founders in regulated health technology are the most relevant audience. He has not published a check size, target stage or list of sectors that we could find.
- Betterness: Miami-based augmented wellness platform and maker of the voice-first AI coach Bett-i. He took part in its $2.5M seed round, announced in April 2026.
- buttondown.com/AngelRegistry/archive/angel-registry-update-april-29-20
- citybiz.co/article/837901/betterness-raises-2-5m-seed-launches-ai-well
- crunchbase.com/funding_round/betterness-seed--6979e0cb
- finsmes.com/2026/04/betterness-closes-2-5m-in-seed-funding.html
- entrepreneurs-institute.com/betterness-raises-2-5m-seed-round-launches
Investing activity
Justin Stone appears in 1 AI deal tracked by the Lounge deals desk. The rounds are mostly Seed, with a median round size of $3M. The most recent is Betterness (Seed, $2.5M, May 2026).
Justin Stone most often invests alongside Eduardo della Maggiora, Apolo Ohno, Martin Varsavsky and Carlos Domingo, and the companies they back on Lounge are mostly in AI.
Deals
Frequently asked questions about Justin Stone
Who is Justin Stone, the angel investor?
He is a Boca Raton attorney and Co-Founder and Managing Partner of JZ Law. He has been Chief Legal Officer at MDLIVE, Thirty Madison and Papa. He invested in the Betterness seed round.
Has Justin Stone invested in AI startups?
Yes. He is listed as an investor in Betterness's $2.5M seed round, announced in April 2026. Betterness builds AI wellness products, including the voice-first coach Bett-i.
What check size does Justin Stone write?
His check size is not public. We found no statement from him and no disclosed amount for his part in the Betterness round.
What stage does Justin Stone invest in?
The only confirmed investment is a seed round. He has made no public statement about preferred stages.
Does Justin Stone invest in health tech founders?
His only confirmed investment is in a health and wellness AI company, and he has spent his career as counsel to health-tech startups. He has not stated a sector focus, so treat this as context rather than a stated thesis.
How can founders reach Justin Stone?
We found no verified personal website or X account. The LinkedIn link we were given appears to belong to a different person, so check identity before reaching out. He is listed as Co-Founder and Managing Partner of JZ Law.
Is Justin Stone an angel investor?
Yes. Justin Stone invests personally as an angel.
What AI companies has Justin Stone invested in?
Justin Stone's AI investments include Betterness. The 1 round on Lounge are listed on this page with amounts, dates and co-investors.
What stage does Justin Stone invest at?
In the rounds tracked on Lounge, Justin Stone has invested at Seed, with a median round of $3M.
Who does Justin Stone co-invest with?
Justin Stone's most frequent co-investors on Lounge are Eduardo della Maggiora (1 deal), Apolo Ohno (1 deal), Martin Varsavsky (1 deal), Carlos Domingo (1 deal) and David Garcia (1 deal).