About

My name is Matt Blumberg. I am a technology entrepreneur and business builder based in New York City. I am CEO of Markup AI, the leading provider of Content Guardian Agents to companies of all sizes looking to scale their use of AI to generate content smartly and safely. We are defining a new category in the Generative AI space and crushing it.

Before that, I started a company called Bolster, which was an on-demand executive talent marketplace.  We created a new way to scale executive teams and boards aimed at early and mid-stage tech companies. The business sort of worked and sort of didn’t work. We wound it down in 2025 and decided to focus on helping the portfolio companies we invested in via Bolster Ventures and help our friends with talent referrals on a more informal basis.

My longest career stint was Return Path, a company I started in 1999, which we sold in 2019.   We created a business that was the global market leader in email intelligence, analyzing more data about email than anyone else in the world and producing applications that solve real business problems for end users, commercial senders, and mailbox providers.  In the end, we served over 4,000 clients with about 450 employees and 12 offices in 7 countries.  We also built a wonderful company with a signature People First Culture that won a number of awards over the years, including Fortune Magazine’s #2 best mid-sized place to work in 2012.

Early in my career, I ran marketing and online services for MovieFone/777-FILM (www.moviefone.com), now a division of AOL. Before that — I was in venture capital at General Atlantic Partners (www.gapartners.com), and before that, a consultant at Mercer Management Consulting (www.mercermc.com). And I went to Princeton before that.

Based on this blog, I wrote a book called Startup CEO:  A Field Guide to Scaling Up Your Business, which was published by Wiley in 2013 and updated in 2020. I followed that by co-authoring a book with a number of my fellow executives from Retutrn Path and Bolster called Startup CXO: A Field Guide to Scaling Up Your Company’s Critical Functions and Teams; as well as the second edition of Startup Boards: A Field Guide to Building and Leading an Effective Board of Directors along with Brad Feld and Mahendra Ramsinghani. I hosted a podcast called The Daily Bolster, with over 200 micro-episodes (mostly 5-6 minutes long) where I interview other CEOs to share their stories and hacks.

I have been married for over 25 years to Mariquita, who is, as I tell her all the time, one of the all-time great wives. We have three great kids now in their late teens, Casey, Wilson, and Elyse.

I have lots of other hobbies and interests, like coaching my kids’ baseball and softball teams; traveling and seeing different corners of the world; reading all sorts of books, particularly about business, American Presidential history, art & architecture, natural sciences (for laymen!), and anything funny; cooking and wishing I lived in a place where I could grill and eat outdoors year-round; playing golf; lumbering my way through the very occasional marathon, eating cheap Mexican food; introducing my kids to classic movies; and playing around with new technology. I hosted a limited edition podcast series called Country Over Self which explored the topic of virtue in the Oval Office along with a dozen prominent presidential historians.

IF YOU WANT TO UNDERSTAND WHAT THIS BLOG IS ALL ABOUT, read my first two postings: You’re Only a First Time CEO Once, and Oh, and About That Picture, as well as my updated post when I relaunched the blog with its new name, StartupCEO.com.