Sheldon Seidman
About Sheldon Seidman
Sheldon Seidman is a dentist in Chicago. Press materials for the HeyDonto round identify him as Dr. Sheldon Seidman, DDS, of Smile Chicago. A LinkedIn profile under his name lists him as owner of Smile Chicago.
In the HeyDonto announcement he said he has practiced dentistry for over 45 years. He described the inability to share patient data between systems as one of the most persistent frustrations of his career.
No public sources found list earlier companies he founded or ran outside his dental practice, or a fund or firm affiliated with his investing.
The one AI investment publicly tied to him is HeyDonto. On April 7, 2026, HeyDonto AI Technology announced a $20M seed round at a $200M valuation. Crunchbase lists Seidman as lead investor. The company release says the round was led by eight private investors, who were practicing dentists and dental industry veterans, with several family offices also participating. He is named in the release as a lead investor.
HeyDonto is based in Knoxville, Tennessee, and describes itself as an AI-native data intelligence company. The funding is meant to scale Conduit, its dental interoperability exchange. Conduit connects dental practice management systems with medical electronic health records and payer systems using standards such as HL7 FHIR.
His quoted reason for investing was that he believed in both the technology and the team. He also called Conduit the missing infrastructure layer for dental. His individual check size has not been disclosed.
The public record is a single disclosed deal, so there is no stated thesis, stage preference or geography. That deal was a seed-stage investment in AI-driven healthcare data infrastructure, specifically dental interoperability, where he has direct professional experience as a practicing dentist. Check size, fund size and any other investments are not public.
- HeyDonto: Knoxville-based AI data intelligence company building Conduit, a dental interoperability exchange. Seidman was a lead investor in its $20M seed round announced April 2026.
- crunchbase.com/organization/heydonto
- newswire.com/news/heydonto-ai-technology-closes-20-million-seed-round-
- oralhealthgroup.com/dental-industry/u-s-ai-company-raises-us20m-to-con
- theaiinsider.tech/2026/04/08/heydonto-ai-technology-closes-20m-seed-ro
- heydonto.com/news/heydonto-closes-20m-seed-round
- linkedin.com/in/sheldon-seidman-0264251b4
- alleywatch.com/2026/04/the-weekly-notable-startup-funding-report-4-13-
Investing activity
Sheldon Seidman appears in 1 AI deal tracked by the Lounge deals desk, rounds totalling $20M, and led 1 of them. The rounds are mostly Seed, with a median round size of $20M. The most recent is HeyDonto (Seed, $20M, Apr 2026).
Deals
Frequently asked questions about Sheldon Seidman
Who is Sheldon Seidman?
Sheldon Seidman, DDS, is a dentist with Smile Chicago who says he has practiced for over 45 years. He is publicly known as a lead investor in HeyDonto's 2026 seed round.
Has Sheldon Seidman invested in AI startups?
Yes. Crunchbase and the company's press release list him as a lead investor in HeyDonto's $20M seed round, announced April 7, 2026. No other AI investments are publicly documented.
What is Sheldon Seidman's check size?
It is not public. The $20M figure is the size of the whole HeyDonto round, which had eight lead private investors and family offices, not his individual investment.
What kind of founders might Sheldon Seidman back?
The only public evidence is HeyDonto, a seed-stage company building healthcare data infrastructure in a field he knows as a practicing dentist. He has not published a thesis, so treat any wider fit as unconfirmed.
Is Sheldon Seidman part of a venture fund?
No fund affiliation appears in the sources found. He is described as a private investor and practicing dentist.
Is Sheldon Seidman an angel investor?
Yes. Sheldon Seidman invests personally as an angel.
What AI companies has Sheldon Seidman invested in?
Sheldon Seidman's AI investments include HeyDonto. The 1 round on Lounge are listed on this page with amounts, dates and co-investors.
What stage does Sheldon Seidman invest at?
In the rounds tracked on Lounge, Sheldon Seidman has invested at Seed, with a median round of $20M. Sheldon Seidman led 1 of those rounds.
How can founders reach Sheldon Seidman?
Founders on Lounge can see Sheldon Seidman's contact details in AI Investor Contacts (paid plans), check for a warm introduction through members who worked with them under Warm Paths, and add Sheldon Seidman to their Investor Pipeline to track the conversation.