James Siminoff
CEO and Chief Inventor, Ring
Jamie is currently the CEO and Chief Inventor of Ring. He is also the Founder and CEO of the design laboratory, EdisonJr. Previously, Jamie was the Co-Founder and CEO of Unsubscribe, Inc. Unsubscribe.com is a technology platform to stop unwanted e-mail at the source. Before that, Jamie founded PhoneTag, the first voicemail to text service in the U.S., which was acquired by Ditech Networks (Nasdaq:DITC) in 2009. Prior to PhoneTag, Jamie founded and is still an active advisor to NobelBiz, a provider of telecommunications services to contact centers. Jamie has received numerous awards for his entrepreneurial accomplishments including being recognized as one of New York’s top six entrepreneurs by Crain’s Magazine (2007) and Laptop Magazine’s top ten mobile mavericks. Jamie holds a bachelor’s degree in entrepreneurship from Babson College in Wellesley, MA and went to Harvard Business School in Cambridge, MA where he bought a t-shirt that he still wears today.
Content & Articles by James Siminoff
Setting Up A Founder-Led Organic LinkedIn Content Machine With Claude
In this Mucker Growth Series session, we invited Jonathan Martinez, founder and CEO of GrowthPair, to share how founder-led LinkedIn content took his startup from zero to $1M in annual...
Lessons From Building An AI-Native Startup with Octagos
In this Mucker Growth Series session, we invited friends from one of our portfolio companies Haley Chute, CPO & CMO, and Harpreet Marwaha, COO & CFO of Octagos, to share...
How To Craft Your Website Messaging & Positioning as a Startup
In this Mucker Growth Series session, Anthony Pierri, co-founder of FletchPMM, walks through how to craft website messaging and positioning as a startup. FletchPMM is a consultancy that has worked...
2026 New York Tech Week Recap of Mucker Sessions
Mucker Capital went to New York Tech Week to host sessions for founders, operators, and builders thinking through how AI is changing product, growth, and search. Among the sessions were:...
Closing Enterprise Deals in Founder-Led Sales as a Startup
In our recent Mucker Growth Series session, I invited David Mackay, Managing Director at D9Y and one of our operating experts at Mucker, to talk about closing enterprise deals in...
The 10 Security Gaps That Plague Startups Before Their A Round
A NOTE ON SEVERITY Not every item on this list carries the same level of risk. Some are the kind of finding that stops a deal. Others are serious but...